What’s behind the enduring popularity of crystals?
Proponents claim the stones can promote health and well-being. janiecbros/Getty Images
As New York City mayor Eric Adams attends ribbon cuttings, marches in parades and bulldozes dirt bikes, he wears an energy stone bracelet that his supporters gave him. In a recent interview, Adams discussed his belief that New York City has a “special energy” because it sits atop a store of rare gems and stones – the so-called “Manhattan schist,” which is over 450 million years old and contains over 100 minerals.
Adams isn’t the only one imbuing rocks with metaphysical significance. During the first year of the pandemic, the crystal industry boomed, with customers hoping the gems might relieve their anxiety.
Some people might be confused about the allure of these stones. But crystal enthusiasts aren’t deviants. Current ideas about crystals come from a larger tradition called “metaphysical religion” that has always been part of the American spiritual landscape.
More than rocks
Technically, a crystal is any matter with a repeating pattern of atoms or molecules. The crystals for sale in shops are known as euhedral crystals because they have well-defined surfaces, or “faces.”
For centuries, people have attributed special properties to crystals. Scientist Carl Sagan, in his book “The Demon-Haunted World,” traces their modern popularity to a series of books written in the 1980s by Katrina Raphaell, who founded The Crystal Academy of Advanced Healing Arts in 1986.
Crystals aren’t just eye-catching stones. Quartz is used in electronics because it possesses piezoelectric properties that cause it to release an electric charge when compressed. But, as skeptics are quick to point out, there is no evidence crystals can bring health, prosperity or any of the other properties that crystal enthusiasts may attribute to them.
Mining the metaphysical
Yet crystals are part of a broader tradition called metaphysical religion, a term coined by historian Catherine Albanese.
Metaphysical religion includes modern New Age movements, a nebulous milieu of alternative spiritual beliefs and practices, such as synchronicity or psychic abilities. Older traditions like Mesmerism, the idea that humans beings emit magnetic energy that can be used for healing, and Spiritualism, the belief that mediums can communicate with the dead, also fall under the metaphysical umbrella.
Albanese ascribes four characteristics to metaphysical traditions: a preoccupation with the mind and its powers; “correspondences,” or the idea of hidden connections between things; a tendency to think in terms of energy and movement; and a yearning for salvation understood as “solace, comfort, therapy, and healing.”
‘Contagious magic’
Metaphysical ideas about crystals exhibit each of these characteristics.
While crystals are physical objects, not thoughts, many crystal enthusiasts recommend “cleansing” and “charging” crystals through visualization and other meditative techniques. So the mind plays a key role in crystal spirituality, as it does in other forms of metaphysical religion.
Crystal sales soared during the pandemic. Genaro Molina/Los Angeles Times via Getty Images
Correspondence refers to the belief found in many occult traditions that ordinary things possess secret qualities or connections to other things. A classic example is astrology, which postulates a correspondence between one’s birthday and certain personality traits. Metaphysical claims about crystals also reflect a belief in correspondences. For example, Colleen McCann, a self-described shaman affiliated with the crystal purveyor Goop, described the positive qualities of different crystals: bloodstones promote good health, rose quartzes help with love, and pink mangano calcites are good for sleep.
Modern crystal enthusiasts often use words like “energy” and “vibrations” that present their ideas in a scientific register. When enthusiasts talk about the energy of crystals – like Eric Adams did – they really mean that it exerts influence within a certain proximity. This is the principle behind crystal water bottles that can be used to “charge” water with “vibrational energy.”
Stripped of scientific language, the logic of energy and vibrations is another form of what anthropologist James Frazer called “contagious magic” found in many cultures, where simply placing one thing next to another is believed to cause an effect.
A source of stigma
Finally, metaphysical religion tends to focus on solving problems in this life rather than the hereafter. This includes health and prosperity, but also emotional growth and well-being. Crystal spirituality is certainly centered around these worldly goals.
This is a big distinction from traditions like Christianity that emphasize salvation in heaven. It is also a factor in why metaphysical ideas are stigmatized despite their popularity.
Protestant Christianity, with its emphasis on “sola fides” – faith alone – has historically dismissed many forms of material religion, or objects with religious significance, as superstition. So in a culture shaped by its historically Protestant majority, some Americans may be predisposed to look at crystal spirituality as foolish, greedy or even blasphemous.
But while claims about the hidden properties of crystals lack scientific validation, so do many of the claims of Christianity and other mainstream religions.
From a historical perspective, Adams’ ideas about crystals don’t make him an outlier. As a scholar of religious studies, I see him as a normal part of the American religious landscape.
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Joseph P. Laycock does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA // Wikimedia Commons
Oct. 1, 2020, marks the 62nd birthday of the National Aeronautics and Space Agency, or NASA. The agency was founded in 1958, the same year President Dwight D. Eisenhower signed the National Aeronautics and Space Act and one year after the Soviets launched Sputnik 1, the world’s first artificial satellite. NASA was designed from the start to push the bounds of space exploration with research into aerospace and aeronautics as well as with a civilian space program.
From putting footprints on the moon in 1969, to launching satellites into space in 1972 to take images of the Earth’s surface, to a proposed 2020 mission to gather samples from Mars, NASA continues to expand our understanding of the vastness of space and change the way we perceive our solar system (and all that lays beyond it). NASA has gathered unimaginable footage, created first-hand accounts of space, and fostered cutting-edge research. Through the creation of new technologies and procedures, NASA created a foundation of ideas that were previously only theories.
As the agency unrelentingly forged a path toward astronomical discovery, NASA also invented a number of technologies that we use in our everyday lives. These include artificial limbs, LASIK surgery, improved water filtration, camera phones, freeze-dried foods, memory foam, LED lights, and even the Dust Buster. In fact, it was a NASA scientist who invented the Super Soaker squirt gun. In honor of NASA’s birthday, Stacker has compiled a list of key astronomy and astrophysics terms from a variety of authoritative science communication sources, including Crash Course: Astronomy, How Stuff Works, and International Comet Quarterly. Keep reading to learn the terms that are commonly used in this fascinating field.
You may also like: Can you answer these real 'Jeopardy!' questions about space?
NASA // Wikimedia CommonsOct. 1, 2020, marks the 62nd birthday of the National Aeronautics and Space Agency, or NASA. The agency was founded in 1958, the same year President Dwight D. Eisenhower signed the National Aeronautics and Space Act and one year after the Soviets launched Sputnik 1, the world’s first artificial satellite. NASA was designed from the start to push the bounds of space exploration with research into aerospace and aeronautics as well as with a civilian space program.
From putting footprints on the moon in 1969, to launching satellites into space in 1972 to take images of the Earth’s surface, to a proposed 2020 mission to gather samples from Mars, NASA continues to expand our understanding of the vastness of space and change the way we perceive our solar system (and all that lays beyond it). NASA has gathered unimaginable footage, created first-hand accounts of space, and fostered cutting-edge research. Through the creation of new technologies and procedures, NASA created a foundation of ideas that were previously only theories.
As the agency unrelentingly forged a path toward astronomical discovery, NASA also invented a number of technologies that we use in our everyday lives. These include artificial limbs, LASIK surgery, improved water filtration, camera phones, freeze-dried foods, memory foam, LED lights, and even the Dust Buster. In fact, it was a NASA scientist who invented the Super Soaker squirt gun. In honor of NASA’s birthday, Stacker has compiled a list of key astronomy and astrophysics terms from a variety of authoritative science communication sources, including Crash Course: Astronomy, How Stuff Works, and International Comet Quarterly. Keep reading to learn the terms that are commonly used in this fascinating field.
You may also like: Can you answer these real 'Jeopardy!' questions about space?
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Similar to how raindrops hit a moving car window as if from an angle, an aberration of light is the phenomenon where stars or other celestial bodies appear from Earth to be slightly off from their true position. This happens because of motion—specifically, the interaction of the Earth’s movement with the speed of light causes this confusing phenomenon.
[Pictured: The bright vertical line and the other rays with barred lines are aberrations caused by the bright flash of the solar flare in a sunspot, 2017.]
NASASimilar to how raindrops hit a moving car window as if from an angle, an aberration of light is the phenomenon where stars or other celestial bodies appear from Earth to be slightly off from their true position. This happens because of motion—specifically, the interaction of the Earth’s movement with the speed of light causes this confusing phenomenon.
[Pictured: The bright vertical line and the other rays with barred lines are aberrations caused by the bright flash of the solar flare in a sunspot, 2017.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsSkatebiker // Wikimedia Commons
Alpha Centauri is the name of the closest star system to earth. It comprises two main stars, Alpha Centauri A and Alpha Centauri B, as well as the closest of the three stars, Proxima Centauri. In 2016, astronomers found an Earth-sized planet orbiting Proxima Centauri, later named Proxima b. While this planet shows signs that life could exist, astronomers are still unsure how habitable it is.
[Pictured: Alpha Centauri (left) and Beta Centauri (right).]
Skatebiker // Wikimedia CommonsAlpha Centauri is the name of the closest star system to earth. It comprises two main stars, Alpha Centauri A and Alpha Centauri B, as well as the closest of the three stars, Proxima Centauri. In 2016, astronomers found an Earth-sized planet orbiting Proxima Centauri, later named Proxima b. While this planet shows signs that life could exist, astronomers are still unsure how habitable it is.
[Pictured: Alpha Centauri (left) and Beta Centauri (right).]
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NASA’s Ingenuity helicopter survives first freezing night on MarsAdam Evans // Wikipedia
Also known as M31, this galaxy is the closest to the Milky Way, where the Earth exists. Andromeda Galaxy has a similar structure to the Milky Way; it is spiral in shape and has a large density of stars, dust, and gas. Because of its proximity, it is the only galaxy that can be seen from Earth with the unaided eye, particularly on fall and winter nights.
Adam Evans // WikipediaAlso known as M31, this galaxy is the closest to the Milky Way, where the Earth exists. Andromeda Galaxy has a similar structure to the Milky Way; it is spiral in shape and has a large density of stars, dust, and gas. Because of its proximity, it is the only galaxy that can be seen from Earth with the unaided eye, particularly on fall and winter nights.
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Asteroids are chunks of rock or metal that used to be parts of other small planets that have broken off due to a collision in space and now orbit the sun. The name asteroid means “star-like.” referring to their emission of light. Asteroids can be lumped into orbital groupings called families and form into an asteroid belt.
NASAAsteroids are chunks of rock or metal that used to be parts of other small planets that have broken off due to a collision in space and now orbit the sun. The name asteroid means “star-like.” referring to their emission of light. Asteroids can be lumped into orbital groupings called families and form into an asteroid belt.
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA Space Place // Wikimedia Commons
A barycenter is the common center mass around which a solar system orbits. While it has become common knowledge that planets orbit stars, it is, in fact, the barycenter that both stars and planets orbit around. Our solar system’s barycenter is constantly changing position based on where each of the planets is in its orbit, ranging from being near the center of the sun to being just outside its surface.
NASA Space Place // Wikimedia CommonsA barycenter is the common center mass around which a solar system orbits. While it has become common knowledge that planets orbit stars, it is, in fact, the barycenter that both stars and planets orbit around. Our solar system’s barycenter is constantly changing position based on where each of the planets is in its orbit, ranging from being near the center of the sun to being just outside its surface.
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
The Big Bang Theory is a model describing the origin of the universe. It explains how the universe expanded from a high-density, high-temperature state into the cosmos we see today. Although there are alternative theories, this is the most widely recognized theory of how the universe began.
[Pictured: Hubble Space Telescope observed one of the most massive known galaxy clusters, RX J1347.5–1145.]
NASAThe Big Bang Theory is a model describing the origin of the universe. It explains how the universe expanded from a high-density, high-temperature state into the cosmos we see today. Although there are alternative theories, this is the most widely recognized theory of how the universe began.
[Pictured: Hubble Space Telescope observed one of the most massive known galaxy clusters, RX J1347.5–1145.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA // Wikipedia
Binary stars are systems that only contain two stars that orbit together. Together, they orbit a common center of mass. There are two types of binary stars: wide binaries and close binaries. Wide binaries orbit with a significant distance apart from each other, causing them to have little effect on each other. Close binaries orbit closely and actually can acquire material from one another.
[Pictured: An artist's depiction of the binary star series, J0806.]
NASA // WikipediaBinary stars are systems that only contain two stars that orbit together. Together, they orbit a common center of mass. There are two types of binary stars: wide binaries and close binaries. Wide binaries orbit with a significant distance apart from each other, causing them to have little effect on each other. Close binaries orbit closely and actually can acquire material from one another.
[Pictured: An artist's depiction of the binary star series, J0806.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA // Wikimedia Commons
Made famous by Einstein’s theory of general relativity, a black hole is the small dense core remnant of a dead star. Since the density of this core is more than about three times more than the density of the sun, the strong force of gravity produces a black hole.
[Pictured: Artist's concept of a supermassive black hole.]
NASA // Wikimedia CommonsMade famous by Einstein’s theory of general relativity, a black hole is the small dense core remnant of a dead star. Since the density of this core is more than about three times more than the density of the sun, the strong force of gravity produces a black hole.
[Pictured: Artist's concept of a supermassive black hole.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
A brown dwarf is born from a collapse of gas and dust, similar to stars. This collapse creates a large amount of energy that gets trapped in a ball of material. The energy emits light from within for tens of millions of years, becoming dimmer as time passes.
[Pictured: Artist's concept of a brown dwarf with bands of clouds.]
NASAA brown dwarf is born from a collapse of gas and dust, similar to stars. This collapse creates a large amount of energy that gets trapped in a ball of material. The energy emits light from within for tens of millions of years, becoming dimmer as time passes.
[Pictured: Artist's concept of a brown dwarf with bands of clouds.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsAnita Hart // Flickr
A celestial sphere is a tool used in spherical astronomy. It is a sphere with a large radius that is concentric with Earth. The sky surrounding the Earth is projected on the sphere, which is helpful for astronomers when they are attempting to plot positions in situations where distances aren’t important.
Anita Hart // FlickrA celestial sphere is a tool used in spherical astronomy. It is a sphere with a large radius that is concentric with Earth. The sky surrounding the Earth is projected on the sphere, which is helpful for astronomers when they are attempting to plot positions in situations where distances aren’t important.
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Besides being a beautiful phenomenon that’s rarely visible from Earth, comets are icy, frozen balls of gas, rock, and dust. Comets gain their trademark bright glow by emitting gas as their orbit passes close to the sun, sometimes even resulting in a glowing tail.
[Pictured: The Kitt Peak National Observatory in Arizona captured this image of Comet NEAT, 2004.]
NASABesides being a beautiful phenomenon that’s rarely visible from Earth, comets are icy, frozen balls of gas, rock, and dust. Comets gain their trademark bright glow by emitting gas as their orbit passes close to the sun, sometimes even resulting in a glowing tail.
[Pictured: The Kitt Peak National Observatory in Arizona captured this image of Comet NEAT, 2004.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsGh5046 // Wikimedia Commons
One of the first things we learn about space is its many constellations. From Orion and his belt to the mythical Seven Sisters and the big and little dipper, constellations map out a group of stars that form shapes in the sky. Constellations were first used by explorers to map direction as well as a tool for storytelling.
[Pictured: A picture of the Big Dipper taken at Koke'e State Park in Hawaii.]
Gh5046 // Wikimedia CommonsOne of the first things we learn about space is its many constellations. From Orion and his belt to the mythical Seven Sisters and the big and little dipper, constellations map out a group of stars that form shapes in the sky. Constellations were first used by explorers to map direction as well as a tool for storytelling.
[Pictured: A picture of the Big Dipper taken at Koke'e State Park in Hawaii.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Like the cosmic mystery its name evokes, dark energy is hard to define. The easiest way to think of it is a property of space that accounts for an expanding universe. The universe’s “empty space” may still have its own, dark energy. However, scientists are still trying to pin down the properties of this dark energy that makes up most of the universe.
[Pictured: Artist's conception of dark energy represented by the purple grid, and gravity by the green grid below.]
NASALike the cosmic mystery its name evokes, dark energy is hard to define. The easiest way to think of it is a property of space that accounts for an expanding universe. The universe’s “empty space” may still have its own, dark energy. However, scientists are still trying to pin down the properties of this dark energy that makes up most of the universe.
[Pictured: Artist's conception of dark energy represented by the purple grid, and gravity by the green grid below.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsSmithsonian Institution // Wikimedia Commons
Somewhat similar to dark energy, dark matter also covers a large chunk of the universe and remains quite mysterious to scientists. The main difference is that dark matter explains more of how groups of objects in the universe function together. Though scientists have a greater understanding of what dark matter isn’t than what it is, a leading theory posits dark matter is made from exotic particles like axions or Weakly Interacting Massive Particles (WIMPS).
[Pictured: Composite image shows the distribution of dark matter, galaxies, and hot gas in the core of the merging galaxy cluster Abell 520.]
Smithsonian Institution // Wikimedia CommonsSomewhat similar to dark energy, dark matter also covers a large chunk of the universe and remains quite mysterious to scientists. The main difference is that dark matter explains more of how groups of objects in the universe function together. Though scientists have a greater understanding of what dark matter isn’t than what it is, a leading theory posits dark matter is made from exotic particles like axions or Weakly Interacting Massive Particles (WIMPS).
[Pictured: Composite image shows the distribution of dark matter, galaxies, and hot gas in the core of the merging galaxy cluster Abell 520.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA/JPL-Caltech // Wikimedia Commons
Also known to most as the Doppler effect, the Doppler shift explains the phenomenon of the change in frequency of a wave in relation to an observer. This can be observed when an ambulance drives past you and the volume of the siren doesn’t quite match with the proximity of the ambulance to you.
[Pictured: Doppler shift due to stellar wobble caused by an exoplanet.]
NASA/JPL-Caltech // Wikimedia CommonsAlso known to most as the Doppler effect, the Doppler shift explains the phenomenon of the change in frequency of a wave in relation to an observer. This can be observed when an ambulance drives past you and the volume of the siren doesn’t quite match with the proximity of the ambulance to you.
[Pictured: Doppler shift due to stellar wobble caused by an exoplanet.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
An eclipse refers to one body in space moving into the shadow of another body. Eclipses can exist in two forms—solar and lunar—depending on the orbit of the Earth and moon. With a lunar eclipse, the moon moves behind the Earth. During a solar eclipse, the moon orbits between the Earth and the sun.
[Pictured: Moon traversing the face of the sun during a solar eclipse.]
NASAAn eclipse refers to one body in space moving into the shadow of another body. Eclipses can exist in two forms—solar and lunar—depending on the orbit of the Earth and moon. With a lunar eclipse, the moon moves behind the Earth. During a solar eclipse, the moon orbits between the Earth and the sun.
[Pictured: Moon traversing the face of the sun during a solar eclipse.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
During an equinox, Earth experiences an even 12 hours of daytime and 12 hours of nighttime. This occurs twice a year: The March equinox marks spring’s arrival in the Northern Hemisphere and Fall in the Southern Hemisphere. The September equinox ushers in the fall’s arrival in the north and spring in the south.
[Pictured: Cassini captures equinox on Saturn.]
NASADuring an equinox, Earth experiences an even 12 hours of daytime and 12 hours of nighttime. This occurs twice a year: The March equinox marks spring’s arrival in the Northern Hemisphere and Fall in the Southern Hemisphere. The September equinox ushers in the fall’s arrival in the north and spring in the south.
[Pictured: Cassini captures equinox on Saturn.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsAlexander Mokletsov // Wikimedia Commons
Escape velocity is the speed that an object needs in order to escape a planet or moon’s gravitational pull. For example, the escape velocity for a spaceship to leave the surface of Earth is about 25,000 miles per hour.
[Pictured: Luna 1 was the first man-made object to attain escape velocity from Earth.]
Alexander Mokletsov // Wikimedia CommonsEscape velocity is the speed that an object needs in order to escape a planet or moon’s gravitational pull. For example, the escape velocity for a spaceship to leave the surface of Earth is about 25,000 miles per hour.
[Pictured: Luna 1 was the first man-made object to attain escape velocity from Earth.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
When planets exist beyond our solar system and orbit a star other than the sun, they are called an exoplanet. Exoplanets are extremely hard to see, as they are often hidden by the glare of the star they orbit. Because of that, the first exoplanet was not recognized until 1992.
[Pictured: Kepler's exoplanet discovery.]
NASAWhen planets exist beyond our solar system and orbit a star other than the sun, they are called an exoplanet. Exoplanets are extremely hard to see, as they are often hidden by the glare of the star they orbit. Because of that, the first exoplanet was not recognized until 1992.
[Pictured: Kepler's exoplanet discovery.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsDepartment of Energy. Office of Public Affairs // Wikimedia Commons
Named after Italian-American physicist Enrico Fermi, the Fermi paradox is a theory using statistical analysis to postulate why we have yet to see signs of life on other planets within our galaxy. The paradox assesses the likeliness that there are similar planets to Earth within the Milky Way, and likely have the ability to support life, yet no signs of life have been found which means it’s a paradox.
[Pictured: Enrico Fermi, Italian-American physicist, received the 1938 Nobel Prize in physics.]
Department of Energy. Office of Public Affairs // Wikimedia CommonsNamed after Italian-American physicist Enrico Fermi, the Fermi paradox is a theory using statistical analysis to postulate why we have yet to see signs of life on other planets within our galaxy. The paradox assesses the likeliness that there are similar planets to Earth within the Milky Way, and likely have the ability to support life, yet no signs of life have been found which means it’s a paradox.
[Pictured: Enrico Fermi, Italian-American physicist, received the 1938 Nobel Prize in physics.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
We all know that we live in the Milky Way galaxy, but what exactly is a galaxy? A galaxy is a wide-ranging mix of dust, gas, stars, and various solar systems brought together by a singular gravitational pull.
[Pictured: The perfectly picturesque spiral galaxy known as Messier 81, or M81, looks sharp in this new composite from NASA's Spitzer and Hubble space telescopes and NASA's Galaxy Evolution Explorer.]
NASAWe all know that we live in the Milky Way galaxy, but what exactly is a galaxy? A galaxy is a wide-ranging mix of dust, gas, stars, and various solar systems brought together by a singular gravitational pull.
[Pictured: The perfectly picturesque spiral galaxy known as Messier 81, or M81, looks sharp in this new composite from NASA's Spitzer and Hubble space telescopes and NASA's Galaxy Evolution Explorer.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA/GSFC // Wikimedia Commons
A gamma-ray burst is the most violent type of explosion in the universe. The explosion itself emits more energy in 10 seconds than the sun will emit in its lifetime. When it happens, it’s the brightest source of light in the observable universe. Satellite evidence suggests gamma-ray bursts are the result of matter collapsing into black holes.
[Pictured: Illustration of a gamma-ray burst.]
NASA/GSFC // Wikimedia CommonsA gamma-ray burst is the most violent type of explosion in the universe. The explosion itself emits more energy in 10 seconds than the sun will emit in its lifetime. When it happens, it’s the brightest source of light in the observable universe. Satellite evidence suggests gamma-ray bursts are the result of matter collapsing into black holes.
[Pictured: Illustration of a gamma-ray burst.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsJim Campbell/Aero-News Network // Wikipedia
Based on the Latin word for “weight,” gravity is a natural phenomenon where things with mass or energy are drawn toward its center. The force of gravity is what keeps us planted on Earth’s surface and also keeps the Earth orbiting the sun.
[Pictured: Stephen Hawking (center) enjoys zero gravity during a flight aboard a modified Boeing 727 aircraft.]
Jim Campbell/Aero-News Network // WikipediaBased on the Latin word for “weight,” gravity is a natural phenomenon where things with mass or energy are drawn toward its center. The force of gravity is what keeps us planted on Earth’s surface and also keeps the Earth orbiting the sun.
[Pictured: Stephen Hawking (center) enjoys zero gravity during a flight aboard a modified Boeing 727 aircraft.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsBruno Gilli/ESO // Wikimedia Commons
A hypergalaxy consists of one large dominant galaxy surrounded by various smaller tertiary galaxies. The Milky Way and our neighboring Andromeda galaxies are both hypergalaxies.
[Pictured: The Milky Way, an example of a hypergalaxy.]
Bruno Gilli/ESO // Wikimedia CommonsA hypergalaxy consists of one large dominant galaxy surrounded by various smaller tertiary galaxies. The Milky Way and our neighboring Andromeda galaxies are both hypergalaxies.
[Pictured: The Milky Way, an example of a hypergalaxy.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsBob King // Wikimedia Commons
A light-year is as simple a concept as its name suggests. It is an astronomical distance that measures the distance that light travels in a year. One light-year roughly equates to 6 trillion miles.
Bob King // Wikimedia CommonsA light-year is as simple a concept as its name suggests. It is an astronomical distance that measures the distance that light travels in a year. One light-year roughly equates to 6 trillion miles.
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Understanding Magellanic clouds has become a propelling source of understanding distant galaxies. They consist of two irregular galaxies that orbit the Milky Way. Orbiting about 200,000 light-years away, the Magellanic clouds are formed by the Large Magellanic Cloud and the Small Magellanic Cloud.
[Pictured: Small Magellanic Cloud galaxy captured by NASA's Great Observatories.]
NASAUnderstanding Magellanic clouds has become a propelling source of understanding distant galaxies. They consist of two irregular galaxies that orbit the Milky Way. Orbiting about 200,000 light-years away, the Magellanic clouds are formed by the Large Magellanic Cloud and the Small Magellanic Cloud.
[Pictured: Small Magellanic Cloud galaxy captured by NASA's Great Observatories.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Magnitude refers to a mathematical measurement for something's size or extent in comparison to other similar objects. In astronomy, magnitude is a unitless system used to measure the varying degrees of brightness of objects in the sky. Greek astronomer Hipparchus introduced the concept of magnitude for classifying stars in 129 B.C., referring to the brightest stars in the sky as "first magnitude."
[Pictured: This is a low-resolution version of the skymap. The threshold magnitude is 3.0 so the Milky Way is very faint.]
NASAMagnitude refers to a mathematical measurement for something's size or extent in comparison to other similar objects. In astronomy, magnitude is a unitless system used to measure the varying degrees of brightness of objects in the sky. Greek astronomer Hipparchus introduced the concept of magnitude for classifying stars in 129 B.C., referring to the brightest stars in the sky as "first magnitude."
[Pictured: This is a low-resolution version of the skymap. The threshold magnitude is 3.0 so the Milky Way is very faint.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNavicore // Wikimedia Commons
A meteor is a rocky object or asteroid that vaporizes when entering the Earth’s atmosphere. They’re often called “shooting stars” and provide a beautiful glowing tail as they enter the atmosphere. Next time you see one, be sure to make a wish upon a meteor!
[Pictured: A meteor during the Leonid meteor shower.]
Navicore // Wikimedia CommonsA meteor is a rocky object or asteroid that vaporizes when entering the Earth’s atmosphere. They’re often called “shooting stars” and provide a beautiful glowing tail as they enter the atmosphere. Next time you see one, be sure to make a wish upon a meteor!
[Pictured: A meteor during the Leonid meteor shower.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
The Earth’s galactic home, the Milky Way is a spiral galaxy that is constantly rotating. The Milky Way contains a high amount of dust and gas wrapped around the central galactic bulge. The galactic bulge contains a dense amount of dust, gas and stars. And within that bulge, exists a large black hole (see slide #8). Our solar system lies about 30,000 light-years from the galaxy’s center.
[Pictured: The Milky Way captured by NASA's Spitzer Space Telescope.]
NASAThe Earth’s galactic home, the Milky Way is a spiral galaxy that is constantly rotating. The Milky Way contains a high amount of dust and gas wrapped around the central galactic bulge. The galactic bulge contains a dense amount of dust, gas and stars. And within that bulge, exists a large black hole (see slide #8). Our solar system lies about 30,000 light-years from the galaxy’s center.
[Pictured: The Milky Way captured by NASA's Spitzer Space Telescope.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
The moon is a heavenly body that orbits the Earth and happens to be the easiest object to spot in the night sky. As the moon orbits our planet, we see it go through “phases,” where at different times different proportions of the moon’s surface are visible. These phases have guided time since the beginning of humanity. The calendar month roughly replicates the moon’s orbit of the Earth.
[Pictured: Moon's north pole assembled from 18 images captured by Galileo's imaging system.]
NASAThe moon is a heavenly body that orbits the Earth and happens to be the easiest object to spot in the night sky. As the moon orbits our planet, we see it go through “phases,” where at different times different proportions of the moon’s surface are visible. These phases have guided time since the beginning of humanity. The calendar month roughly replicates the moon’s orbit of the Earth.
[Pictured: Moon's north pole assembled from 18 images captured by Galileo's imaging system.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
A nebula is a large cloud of dust and gas in space that is produced when a star dies. The gas and dust eventually clump together into a mass large enough to form its own gravity. Nebulae can also be places for new stars to form and are sometimes referred to as “star nurseries.”
[Pictured: The Seagull nebula.]
NASAA nebula is a large cloud of dust and gas in space that is produced when a star dies. The gas and dust eventually clump together into a mass large enough to form its own gravity. Nebulae can also be places for new stars to form and are sometimes referred to as “star nurseries.”
[Pictured: The Seagull nebula.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsInternet Archive Book Images // Wikimedia Commons
The Nebular hypothesis is the most widely accepted theory of how our solar system was born. The theory itself was born during the Scientific Revolution from the 16th to18th centuries. The theory’s essence states that our solar system was birthed from a nebula billions of years ago. The theory has also been applied to how all stars came to be.
[Pictured: The nebular hypothesis of Laplace, 1882.]
Internet Archive Book Images // Wikimedia CommonsThe Nebular hypothesis is the most widely accepted theory of how our solar system was born. The theory itself was born during the Scientific Revolution from the 16th to18th centuries. The theory’s essence states that our solar system was birthed from a nebula billions of years ago. The theory has also been applied to how all stars came to be.
[Pictured: The nebular hypothesis of Laplace, 1882.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsCasey Reed - Penn State University // Wikimedia Commons
Neutron stars are small, but very dense objects that are birthed by the explosive death of a giant star. Neutron stars can exist in two states. The first is a pulsar, which emits a narrow radiation beam. The second is a magnetar, which has a powerful magnetic field that has the force to distort atoms.
[Pictured: Artist's illustration of an 'isolated neutron star.']
Casey Reed - Penn State University // Wikimedia CommonsNeutron stars are small, but very dense objects that are birthed by the explosive death of a giant star. Neutron stars can exist in two states. The first is a pulsar, which emits a narrow radiation beam. The second is a magnetar, which has a powerful magnetic field that has the force to distort atoms.
[Pictured: Artist's illustration of an 'isolated neutron star.']
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Named after astronomer Jan Oort whose theory about a cloud comprising a shell of icy objects existing beyond the Kuiper Belt, or the region that exists in our solar system beyond Neptune, could be responsible for the long-term comets visible from Earth (like Halley’s). The cloud is theorized to comprise the remains of disc materials of planets and the sun.
[Pictured: This artist's concept puts solar system distances in perspective.]
NASANamed after astronomer Jan Oort whose theory about a cloud comprising a shell of icy objects existing beyond the Kuiper Belt, or the region that exists in our solar system beyond Neptune, could be responsible for the long-term comets visible from Earth (like Halley’s). The cloud is theorized to comprise the remains of disc materials of planets and the sun.
[Pictured: This artist's concept puts solar system distances in perspective.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA // Wikimedia Commons
In short, an orbit is the gravitationally curved trajectory of an object in space. In other words, an orbit is the circular motion in which objects in space travel due to gravity’s pull. For example, the moon orbits around the Earth and the Earth orbits around the sun in a circular motion. An object that orbits another is called its satellite.
[Pictured: The International Space Station orbits above Earth.]
NASA // Wikimedia CommonsIn short, an orbit is the gravitationally curved trajectory of an object in space. In other words, an orbit is the circular motion in which objects in space travel due to gravity’s pull. For example, the moon orbits around the Earth and the Earth orbits around the sun in a circular motion. An object that orbits another is called its satellite.
[Pictured: The International Space Station orbits above Earth.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Measuring using parallax involves estimating the distance of nearby celestial objects by measuring movement against more distant celestial objects. This method is often used when measuring distances of neighboring stars, called stellar parallax.
[Pictured: Artist's concept of parallax.]
NASAMeasuring using parallax involves estimating the distance of nearby celestial objects by measuring movement against more distant celestial objects. This method is often used when measuring distances of neighboring stars, called stellar parallax.
[Pictured: Artist's concept of parallax.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Quasars are large distant objects in space that are powered by large, powerful black holes. They tend to shine so brightly that their light eclipses the old galaxies that they exist within. They are capable of emitting thousands of times more energy than the Milky Way emits.
[Pictured: Artist's concept of a quasar.]
NASAQuasars are large distant objects in space that are powered by large, powerful black holes. They tend to shine so brightly that their light eclipses the old galaxies that they exist within. They are capable of emitting thousands of times more energy than the Milky Way emits.
[Pictured: Artist's concept of a quasar.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
A red giant is a star that is reaching its final days and approaching death. If a star has turned into a red giant, the star is in the last states of its stellar evolution and expands. Our own sun will eventually expand and turn into a red giant—but not for a few billion years.
[Pictured: Image shows the "bow shock" of a dying star named R Hydrae, or R Hya, in the constellation Hydra.]
NASAA red giant is a star that is reaching its final days and approaching death. If a star has turned into a red giant, the star is in the last states of its stellar evolution and expands. Our own sun will eventually expand and turn into a red giant—but not for a few billion years.
[Pictured: Image shows the "bow shock" of a dying star named R Hydrae, or R Hya, in the constellation Hydra.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Red shift and blue shift explain how light changes wavelength as objects in space move closer or farther from each other. As an object moves away from us, the light is shifted towards the red end of the color spectrum. In turn, as it moves closer, the light shifts towards the blue end of the spectrum. Along with blue shift, red shift is hugely valuable in understanding the universe’s expansion.
[Pictured: Image of what could be the most distant galaxy ever seen. The small galaxy's starlight has been stretched into longer wavelengths, or "redshifted," by the expansion of the universe.]
NASARed shift and blue shift explain how light changes wavelength as objects in space move closer or farther from each other. As an object moves away from us, the light is shifted towards the red end of the color spectrum. In turn, as it moves closer, the light shifts towards the blue end of the spectrum. Along with blue shift, red shift is hugely valuable in understanding the universe’s expansion.
[Pictured: Image of what could be the most distant galaxy ever seen. The small galaxy's starlight has been stretched into longer wavelengths, or "redshifted," by the expansion of the universe.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
A solar system is a gravitationally bound system of a sun and the objects that orbit it. That includes the bodies that orbit the objects orbiting the sun. For example, our solar system contains the sun, the planets that orbit it, as well as moons and other objects that orbit them.
[Pictured: Stylized rendition of our solar system.]
NASAA solar system is a gravitationally bound system of a sun and the objects that orbit it. That includes the bodies that orbit the objects orbiting the sun. For example, our solar system contains the sun, the planets that orbit it, as well as moons and other objects that orbit them.
[Pictured: Stylized rendition of our solar system.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Solar wind is a wind streaming solar particles and plasma from the sun. As a solar wind carries charged particles from the sun towards the Earth could have catastrophic effects for Earth’s habitants. But don’t worry, Earth’s magnetic field provides a pretty sturdy shield against any of these negative effects.
[Pictured: Conditions observed by NASA's Cassini spacecraft during a flyby depicting solar wind on Titan.]
NASASolar wind is a wind streaming solar particles and plasma from the sun. As a solar wind carries charged particles from the sun towards the Earth could have catastrophic effects for Earth’s habitants. But don’t worry, Earth’s magnetic field provides a pretty sturdy shield against any of these negative effects.
[Pictured: Conditions observed by NASA's Cassini spacecraft during a flyby depicting solar wind on Titan.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsCreative Commons // Wikimedia Commons
Sometimes referred to as the “noodle effect,” Spaghettification is when the extreme tidal forces stretch out objects to be long and thin like a noodle. This effect can also be caused by the immense gravitational pull of a black hole.
[Pictured: Illustration showing what spaghettification will do to an astronaut entering a small black hole's event horizon.]
Creative Commons // Wikimedia CommonsSometimes referred to as the “noodle effect,” Spaghettification is when the extreme tidal forces stretch out objects to be long and thin like a noodle. This effect can also be caused by the immense gravitational pull of a black hole.
[Pictured: Illustration showing what spaghettification will do to an astronaut entering a small black hole's event horizon.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
Other than serving as beautiful guiding lights in our sky, stars are astronomical objects that are composed of gas that pulls itself together with its own gravitational pull. Nuclear fusion at the star’s core creates the light that stars emit.
[Pictured: Star from the Lizard constellation.]
NASAOther than serving as beautiful guiding lights in our sky, stars are astronomical objects that are composed of gas that pulls itself together with its own gravitational pull. Nuclear fusion at the star’s core creates the light that stars emit.
[Pictured: Star from the Lizard constellation.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
In the same way that planets can be gravitationally bound to the sun, causing them to orbit it, stars can also cluster together due to gravity. Two types of star clusters can be determined: globular clusters and open clusters. Globular clusters are tight clusters of thousands of older stars, whereas open clusters are made up of a few hundred very young stars.
NASAIn the same way that planets can be gravitationally bound to the sun, causing them to orbit it, stars can also cluster together due to gravity. Two types of star clusters can be determined: globular clusters and open clusters. Globular clusters are tight clusters of thousands of older stars, whereas open clusters are made up of a few hundred very young stars.
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
A supernova is the largest explosion that can be seen with the human eye. A supernova occurs as the last step of a dying massive star that emits an extremely bright light. This occurs in the death of a star at least five times the mass of our solar system’s sun.
[Pictured: Data combined from four different space telescopes to create a multi-wavelength view of a supernova called RCW 86.]
NASAA supernova is the largest explosion that can be seen with the human eye. A supernova occurs as the last step of a dying massive star that emits an extremely bright light. This occurs in the death of a star at least five times the mass of our solar system’s sun.
[Pictured: Data combined from four different space telescopes to create a multi-wavelength view of a supernova called RCW 86.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsRuffnax // Wikipedia
A telescope is the signature tool of astronomers to see far objects out in space in further detail. Today, telescopes are designed with curved mirrors that gather light from the sky and concentrates it so that far away objects are visible.
[Pictured: The Hubble Space Telescope as seen from the departing Space Shuttle Atlantis.]
Ruffnax // WikipediaA telescope is the signature tool of astronomers to see far objects out in space in further detail. Today, telescopes are designed with curved mirrors that gather light from the sky and concentrates it so that far away objects are visible.
[Pictured: The Hubble Space Telescope as seen from the departing Space Shuttle Atlantis.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsPublic Domain // Wikimedia Commons
The theory of relativity was developed by Albert Einstein in 1905 and includes both theories of special relativity and general relativity. The theory determines that the laws of physics are the same for all non-accelerating observers and was monumental in introducing a framework for space and time.
Public Domain // Wikimedia CommonsThe theory of relativity was developed by Albert Einstein in 1905 and includes both theories of special relativity and general relativity. The theory determines that the laws of physics are the same for all non-accelerating observers and was monumental in introducing a framework for space and time.
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NASA’s Ingenuity helicopter survives first freezing night on MarsLookang // Wikimedia Commons
Tides are the rise and fall of sea level that is caused by the gravitational pull of the moon and the sun. They are one of the most reliable phenomena in the world. The difference between high and low tide is called the tidal range.
Lookang // Wikimedia CommonsTides are the rise and fall of sea level that is caused by the gravitational pull of the moon and the sun. They are one of the most reliable phenomena in the world. The difference between high and low tide is called the tidal range.
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
A white dwarf is a relatively small star that is about the size of a planet that is very dense. It is essentially a star that has exhausted all of its nuclear fuel from within. It expels most of its outer material, leaving a white-hot core that cools over the next billion years.
[Pictured: NGC 7293, better known as the Helix nebula. The core of the star is a small, hot, dense remnant known as a white dwarf.]
NASAA white dwarf is a relatively small star that is about the size of a planet that is very dense. It is essentially a star that has exhausted all of its nuclear fuel from within. It expels most of its outer material, leaving a white-hot core that cools over the next billion years.
[Pictured: NGC 7293, better known as the Helix nebula. The core of the star is a small, hot, dense remnant known as a white dwarf.]
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NASA’s Ingenuity helicopter survives first freezing night on MarsNASA
And lastly, we have landed at the universe. A loaded definition that has flummoxed scientists for generations, a universe contains billions of galaxies and even more stars along with their planets, moons, asteroids, comets, dust, and gas, all of which exists swirling around in the massive thing we call space.
[Pictured: Deep space images ever captured by the Hubble.]
You may also like: Can you answer these real 'Jeopardy!' questions about space?
NASAAnd lastly, we have landed at the universe. A loaded definition that has flummoxed scientists for generations, a universe contains billions of galaxies and even more stars along with their planets, moons, asteroids, comets, dust, and gas, all of which exists swirling around in the massive thing we call space.
[Pictured: Deep space images ever captured by the Hubble.]
You may also like: Can you answer these real 'Jeopardy!' questions about space?
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50 space terms for understanding the universeNASA // Wikimedia Commons
The National Aeronautics and Space Agency, or NASA, was founded in 1958—the same year President Dwight D. Eisenhower signed the National Aeronautics and Space Act and one year after the Soviets launched Sputnik 1, the world’s first artificial satellite. NASA was designed from the start to push the bounds of space exploration with research into aerospace and aeronautics as well as with a civilian space program.
In honor of National Space Day on May 6, Stacker compiled a list of key astronomy and astrophysics terms from a variety of authoritative science communication sources, including Crash Course: Astronomy, How Stuff Works, and International Comet Quarterly.
As the agency unrelentingly forged a path toward astronomical discovery, NASA also invented a number of technologies that we use in our everyday lives. These include artificial limbs, LASIK surgery, improved water filtration, camera phones, freeze-dried foods, memory foam, LED lights, and even the Dust Buster. In fact, it was a NASA scientist who invented the Super Soaker squirt gun.
Keep reading to learn the terms that are commonly used in this fascinating field.
You may also like: Can you answer these real 'Jeopardy!' questions about space?
NASA // Wikimedia CommonsThe National Aeronautics and Space Agency, or NASA, was founded in 1958—the same year President Dwight D. Eisenhower signed the National Aeronautics and Space Act and one year after the Soviets launched Sputnik 1, the world’s first artificial satellite. NASA was designed from the start to push the bounds of space exploration with research into aerospace and aeronautics as well as with a civilian space program.
In honor of National Space Day on May 6, Stacker compiled a list of key astronomy and astrophysics terms from a variety of authoritative science communication sources, including Crash Course: Astronomy, How Stuff Works, and International Comet Quarterly.
As the agency unrelentingly forged a path toward astronomical discovery, NASA also invented a number of technologies that we use in our everyday lives. These include artificial limbs, LASIK surgery, improved water filtration, camera phones, freeze-dried foods, memory foam, LED lights, and even the Dust Buster. In fact, it was a NASA scientist who invented the Super Soaker squirt gun.
Keep reading to learn the terms that are commonly used in this fascinating field.
You may also like: Can you answer these real 'Jeopardy!' questions about space?

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50 space terms for understanding the universeNASA
Similar to how raindrops hit a moving car window as if from an angle, an aberration of light is the phenomenon where stars or other celestial bodies appear from Earth to be slightly off from their true position. This happens because of motion—specifically, the interaction of the Earth’s movement with the speed of light causes this confusing phenomenon.
[Pictured: The bright vertical line and the other rays with barred lines are aberrations caused by the bright flash of the solar flare in a sunspot, 2017.]
NASASimilar to how raindrops hit a moving car window as if from an angle, an aberration of light is the phenomenon where stars or other celestial bodies appear from Earth to be slightly off from their true position. This happens because of motion—specifically, the interaction of the Earth’s movement with the speed of light causes this confusing phenomenon.
[Pictured: The bright vertical line and the other rays with barred lines are aberrations caused by the bright flash of the solar flare in a sunspot, 2017.]
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50 space terms for understanding the universeSkatebiker // Wikimedia Commons
Alpha Centauri is the name of the closest star system to earth. It comprises two main stars, Alpha Centauri A and Alpha Centauri B, as well as the closest of the three stars, Proxima Centauri. In 2016, astronomers found an Earth-sized planet orbiting Proxima Centauri, later named Proxima b. While this planet shows signs that life could exist, astronomers are still unsure how habitable it is.
[Pictured: Alpha Centauri (left) and Beta Centauri (right).]
Skatebiker // Wikimedia CommonsAlpha Centauri is the name of the closest star system to earth. It comprises two main stars, Alpha Centauri A and Alpha Centauri B, as well as the closest of the three stars, Proxima Centauri. In 2016, astronomers found an Earth-sized planet orbiting Proxima Centauri, later named Proxima b. While this planet shows signs that life could exist, astronomers are still unsure how habitable it is.
[Pictured: Alpha Centauri (left) and Beta Centauri (right).]
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50 space terms for understanding the universeAdam Evans // Wikipedia
Also known as M31, this galaxy is the closest to the Milky Way, where the Earth exists. Andromeda Galaxy has a similar structure to the Milky Way; it is spiral in shape and has a large density of stars, dust, and gas. Because of its proximity, it is the only galaxy that can be seen from Earth with the unaided eye, particularly on fall and winter nights.
Adam Evans // WikipediaAlso known as M31, this galaxy is the closest to the Milky Way, where the Earth exists. Andromeda Galaxy has a similar structure to the Milky Way; it is spiral in shape and has a large density of stars, dust, and gas. Because of its proximity, it is the only galaxy that can be seen from Earth with the unaided eye, particularly on fall and winter nights.
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50 space terms for understanding the universeNASA
Asteroids are chunks of rock or metal that used to be parts of other small planets that have broken off due to a collision in space and now orbit the sun. The name asteroid means “star-like.” referring to their emission of light. Asteroids can be lumped into orbital groupings called families and form into an asteroid belt.
NASAAsteroids are chunks of rock or metal that used to be parts of other small planets that have broken off due to a collision in space and now orbit the sun. The name asteroid means “star-like.” referring to their emission of light. Asteroids can be lumped into orbital groupings called families and form into an asteroid belt.
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50 space terms for understanding the universeNASA Space Place // Wikimedia Commons
A barycenter is the common center mass around which a solar system orbits. While it has become common knowledge that planets orbit stars, it is, in fact, the barycenter that both stars and planets orbit around. Our solar system’s barycenter is constantly changing position based on where each of the planets is in its orbit, ranging from being near the center of the sun to being just outside its surface.
NASA Space Place // Wikimedia CommonsA barycenter is the common center mass around which a solar system orbits. While it has become common knowledge that planets orbit stars, it is, in fact, the barycenter that both stars and planets orbit around. Our solar system’s barycenter is constantly changing position based on where each of the planets is in its orbit, ranging from being near the center of the sun to being just outside its surface.
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50 space terms for understanding the universeNASA
The Big Bang Theory is a model describing the origin of the universe. It explains how the universe expanded from a high-density, high-temperature state into the cosmos we see today. Although there are alternative theories, this is the most widely recognized theory of how the universe began.
[Pictured: Hubble Space Telescope observed one of the most massive known galaxy clusters, RX J1347.5–1145.]
NASAThe Big Bang Theory is a model describing the origin of the universe. It explains how the universe expanded from a high-density, high-temperature state into the cosmos we see today. Although there are alternative theories, this is the most widely recognized theory of how the universe began.
[Pictured: Hubble Space Telescope observed one of the most massive known galaxy clusters, RX J1347.5–1145.]
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50 space terms for understanding the universeNASA // Wikipedia
Binary stars are systems that only contain two stars that orbit together. Together, they orbit a common center of mass. There are two types of binary stars: wide binaries and close binaries. Wide binaries orbit with a significant distance apart from each other, causing them to have little effect on each other. Close binaries orbit closely and actually can acquire material from one another.
[Pictured: An artist's depiction of the binary star series, J0806.]
NASA // WikipediaBinary stars are systems that only contain two stars that orbit together. Together, they orbit a common center of mass. There are two types of binary stars: wide binaries and close binaries. Wide binaries orbit with a significant distance apart from each other, causing them to have little effect on each other. Close binaries orbit closely and actually can acquire material from one another.
[Pictured: An artist's depiction of the binary star series, J0806.]
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50 space terms for understanding the universeNASA // Wikimedia Commons
Made famous by Einstein’s theory of general relativity, a black hole is the small dense core remnant of a dead star. Since the density of this core is more than about three times more than the density of the sun, the strong force of gravity produces a black hole.
[Pictured: Artist's concept of a supermassive black hole.]
NASA // Wikimedia CommonsMade famous by Einstein’s theory of general relativity, a black hole is the small dense core remnant of a dead star. Since the density of this core is more than about three times more than the density of the sun, the strong force of gravity produces a black hole.
[Pictured: Artist's concept of a supermassive black hole.]
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50 space terms for understanding the universeNASA
A brown dwarf is born from a collapse of gas and dust, similar to stars. This collapse creates a large amount of energy that gets trapped in a ball of material. The energy emits light from within for tens of millions of years, becoming dimmer as time passes.
[Pictured: Artist's concept of a brown dwarf with bands of clouds.]
NASAA brown dwarf is born from a collapse of gas and dust, similar to stars. This collapse creates a large amount of energy that gets trapped in a ball of material. The energy emits light from within for tens of millions of years, becoming dimmer as time passes.
[Pictured: Artist's concept of a brown dwarf with bands of clouds.]
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50 space terms for understanding the universeAnita Hart // Flickr
A celestial sphere is a tool used in spherical astronomy. It is a sphere with a large radius that is concentric with Earth. The sky surrounding the Earth is projected on the sphere, which is helpful for astronomers when they are attempting to plot positions in situations where distances aren’t important.
Anita Hart // FlickrA celestial sphere is a tool used in spherical astronomy. It is a sphere with a large radius that is concentric with Earth. The sky surrounding the Earth is projected on the sphere, which is helpful for astronomers when they are attempting to plot positions in situations where distances aren’t important.
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50 space terms for understanding the universeNASA
Besides being a beautiful phenomenon that’s rarely visible from Earth, comets are icy, frozen balls of gas, rock, and dust. Comets gain their trademark bright glow by emitting gas as their orbit passes close to the sun, sometimes even resulting in a glowing tail.
[Pictured: The Kitt Peak National Observatory in Arizona captured this image of Comet NEAT, 2004.]
NASABesides being a beautiful phenomenon that’s rarely visible from Earth, comets are icy, frozen balls of gas, rock, and dust. Comets gain their trademark bright glow by emitting gas as their orbit passes close to the sun, sometimes even resulting in a glowing tail.
[Pictured: The Kitt Peak National Observatory in Arizona captured this image of Comet NEAT, 2004.]
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50 space terms for understanding the universeGh5046 // Wikimedia Commons
One of the first things we learn about space is its many constellations. From Orion and his belt to the mythical Seven Sisters and the big and little dipper, constellations map out a group of stars that form shapes in the sky. Constellations were first used by explorers to map direction as well as a tool for storytelling.
[Pictured: A picture of the Big Dipper taken at Koke'e State Park in Hawaii.]
Gh5046 // Wikimedia CommonsOne of the first things we learn about space is its many constellations. From Orion and his belt to the mythical Seven Sisters and the big and little dipper, constellations map out a group of stars that form shapes in the sky. Constellations were first used by explorers to map direction as well as a tool for storytelling.
[Pictured: A picture of the Big Dipper taken at Koke'e State Park in Hawaii.]
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50 space terms for understanding the universeNASA
Like the cosmic mystery its name evokes, dark energy is hard to define. The easiest way to think of it is a property of space that accounts for an expanding universe. The universe’s “empty space” may still have its own, dark energy. However, scientists are still trying to pin down the properties of this dark energy that makes up most of the universe.
[Pictured: Artist's conception of dark energy represented by the purple grid, and gravity by the green grid below.]
NASALike the cosmic mystery its name evokes, dark energy is hard to define. The easiest way to think of it is a property of space that accounts for an expanding universe. The universe’s “empty space” may still have its own, dark energy. However, scientists are still trying to pin down the properties of this dark energy that makes up most of the universe.
[Pictured: Artist's conception of dark energy represented by the purple grid, and gravity by the green grid below.]
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50 space terms for understanding the universeSmithsonian Institution // Wikimedia Commons
Somewhat similar to dark energy, dark matter also covers a large chunk of the universe and remains quite mysterious to scientists. The main difference is that dark matter explains more of how groups of objects in the universe function together. Though scientists have a greater understanding of what dark matter isn’t than what it is, a leading theory posits dark matter is made from exotic particles like axions or Weakly Interacting Massive Particles (WIMPS).
[Pictured: Composite image shows the distribution of dark matter, galaxies, and hot gas in the core of the merging galaxy cluster Abell 520.]
Smithsonian Institution // Wikimedia CommonsSomewhat similar to dark energy, dark matter also covers a large chunk of the universe and remains quite mysterious to scientists. The main difference is that dark matter explains more of how groups of objects in the universe function together. Though scientists have a greater understanding of what dark matter isn’t than what it is, a leading theory posits dark matter is made from exotic particles like axions or Weakly Interacting Massive Particles (WIMPS).
[Pictured: Composite image shows the distribution of dark matter, galaxies, and hot gas in the core of the merging galaxy cluster Abell 520.]
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50 space terms for understanding the universeNASA/JPL-Caltech // Wikimedia Commons
Also known to most as the Doppler effect, the Doppler shift explains the phenomenon of the change in frequency of a wave in relation to an observer. This can be observed when an ambulance drives past you and the volume of the siren doesn’t quite match with the proximity of the ambulance to you.
[Pictured: Doppler shift due to stellar wobble caused by an exoplanet.]
NASA/JPL-Caltech // Wikimedia CommonsAlso known to most as the Doppler effect, the Doppler shift explains the phenomenon of the change in frequency of a wave in relation to an observer. This can be observed when an ambulance drives past you and the volume of the siren doesn’t quite match with the proximity of the ambulance to you.
[Pictured: Doppler shift due to stellar wobble caused by an exoplanet.]
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50 space terms for understanding the universeNASA
An eclipse refers to one body in space moving into the shadow of another body. Eclipses can exist in two forms—solar and lunar—depending on the orbit of the Earth and moon. With a lunar eclipse, the moon moves behind the Earth. During a solar eclipse, the moon orbits between the Earth and the sun.
[Pictured: Moon traversing the face of the sun during a solar eclipse.]
NASAAn eclipse refers to one body in space moving into the shadow of another body. Eclipses can exist in two forms—solar and lunar—depending on the orbit of the Earth and moon. With a lunar eclipse, the moon moves behind the Earth. During a solar eclipse, the moon orbits between the Earth and the sun.
[Pictured: Moon traversing the face of the sun during a solar eclipse.]
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50 space terms for understanding the universeNASA
During an equinox, Earth experiences an even 12 hours of daytime and 12 hours of nighttime. This occurs twice a year: The March equinox marks spring’s arrival in the Northern Hemisphere and Fall in the Southern Hemisphere. The September equinox ushers in the fall’s arrival in the north and spring in the south.
[Pictured: Cassini captures equinox on Saturn.]
NASADuring an equinox, Earth experiences an even 12 hours of daytime and 12 hours of nighttime. This occurs twice a year: The March equinox marks spring’s arrival in the Northern Hemisphere and Fall in the Southern Hemisphere. The September equinox ushers in the fall’s arrival in the north and spring in the south.
[Pictured: Cassini captures equinox on Saturn.]
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50 space terms for understanding the universeAlexander Mokletsov // Wikimedia Commons
Escape velocity is the speed that an object needs in order to escape a planet or moon’s gravitational pull. For example, the escape velocity for a spaceship to leave the surface of Earth is about 25,000 miles per hour.
[Pictured: Luna 1 was the first man-made object to attain escape velocity from Earth.]
Alexander Mokletsov // Wikimedia CommonsEscape velocity is the speed that an object needs in order to escape a planet or moon’s gravitational pull. For example, the escape velocity for a spaceship to leave the surface of Earth is about 25,000 miles per hour.
[Pictured: Luna 1 was the first man-made object to attain escape velocity from Earth.]
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50 space terms for understanding the universeNASA
When planets exist beyond our solar system and orbit a star other than the sun, they are called an exoplanet. Exoplanets are extremely hard to see, as they are often hidden by the glare of the star they orbit. Because of that, the first exoplanet was not recognized until 1992.
[Pictured: Kepler's exoplanet discovery.]
NASAWhen planets exist beyond our solar system and orbit a star other than the sun, they are called an exoplanet. Exoplanets are extremely hard to see, as they are often hidden by the glare of the star they orbit. Because of that, the first exoplanet was not recognized until 1992.
[Pictured: Kepler's exoplanet discovery.]
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50 space terms for understanding the universeDepartment of Energy. Office of Public Affairs // Wikimedia Commons
Named after Italian-American physicist Enrico Fermi, the Fermi paradox is a theory using statistical analysis to postulate why we have yet to see signs of life on other planets within our galaxy. The paradox assesses the likeliness that there are similar planets to Earth within the Milky Way, and likely have the ability to support life, yet no signs of life have been found which means it’s a paradox.
[Pictured: Enrico Fermi, Italian-American physicist, received the 1938 Nobel Prize in physics.]
Department of Energy. Office of Public Affairs // Wikimedia CommonsNamed after Italian-American physicist Enrico Fermi, the Fermi paradox is a theory using statistical analysis to postulate why we have yet to see signs of life on other planets within our galaxy. The paradox assesses the likeliness that there are similar planets to Earth within the Milky Way, and likely have the ability to support life, yet no signs of life have been found which means it’s a paradox.
[Pictured: Enrico Fermi, Italian-American physicist, received the 1938 Nobel Prize in physics.]
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50 space terms for understanding the universeNASA
We all know that we live in the Milky Way galaxy, but what exactly is a galaxy? A galaxy is a wide-ranging mix of dust, gas, stars, and various solar systems brought together by a singular gravitational pull.
[Pictured: The perfectly picturesque spiral galaxy known as Messier 81, or M81, looks sharp in this new composite from NASA's Spitzer and Hubble space telescopes and NASA's Galaxy Evolution Explorer.]
NASAWe all know that we live in the Milky Way galaxy, but what exactly is a galaxy? A galaxy is a wide-ranging mix of dust, gas, stars, and various solar systems brought together by a singular gravitational pull.
[Pictured: The perfectly picturesque spiral galaxy known as Messier 81, or M81, looks sharp in this new composite from NASA's Spitzer and Hubble space telescopes and NASA's Galaxy Evolution Explorer.]
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50 space terms for understanding the universeNASA/GSFC // Wikimedia Commons
A gamma-ray burst is the most violent type of explosion in the universe. The explosion itself emits more energy in 10 seconds than the sun will emit in its lifetime. When it happens, it’s the brightest source of light in the observable universe. Satellite evidence suggests gamma-ray bursts are the result of matter collapsing into black holes.
[Pictured: Illustration of a gamma-ray burst.]
NASA/GSFC // Wikimedia CommonsA gamma-ray burst is the most violent type of explosion in the universe. The explosion itself emits more energy in 10 seconds than the sun will emit in its lifetime. When it happens, it’s the brightest source of light in the observable universe. Satellite evidence suggests gamma-ray bursts are the result of matter collapsing into black holes.
[Pictured: Illustration of a gamma-ray burst.]
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50 space terms for understanding the universeJim Campbell/Aero-News Network // Wikipedia
Based on the Latin word for “weight,” gravity is a natural phenomenon where things with mass or energy are drawn toward its center. The force of gravity is what keeps us planted on Earth’s surface and also keeps the Earth orbiting the sun.
[Pictured: Stephen Hawking (center) enjoys zero gravity during a flight aboard a modified Boeing 727 aircraft.]
Jim Campbell/Aero-News Network // WikipediaBased on the Latin word for “weight,” gravity is a natural phenomenon where things with mass or energy are drawn toward its center. The force of gravity is what keeps us planted on Earth’s surface and also keeps the Earth orbiting the sun.
[Pictured: Stephen Hawking (center) enjoys zero gravity during a flight aboard a modified Boeing 727 aircraft.]
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50 space terms for understanding the universeBruno Gilli/ESO // Wikimedia Commons
A hypergalaxy consists of one large dominant galaxy surrounded by various smaller tertiary galaxies. The Milky Way and our neighboring Andromeda galaxies are both hypergalaxies.
[Pictured: The Milky Way, an example of a hypergalaxy.]
Bruno Gilli/ESO // Wikimedia CommonsA hypergalaxy consists of one large dominant galaxy surrounded by various smaller tertiary galaxies. The Milky Way and our neighboring Andromeda galaxies are both hypergalaxies.
[Pictured: The Milky Way, an example of a hypergalaxy.]
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50 space terms for understanding the universeBob King // Wikimedia Commons
A light-year is as simple a concept as its name suggests. It is an astronomical distance that measures the distance that light travels in a year. One light-year roughly equates to 6 trillion miles.
Bob King // Wikimedia CommonsA light-year is as simple a concept as its name suggests. It is an astronomical distance that measures the distance that light travels in a year. One light-year roughly equates to 6 trillion miles.
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50 space terms for understanding the universeNASA
Understanding Magellanic clouds has become a propelling source of understanding distant galaxies. They consist of two irregular galaxies that orbit the Milky Way. Orbiting about 200,000 light-years away, the Magellanic clouds are formed by the Large Magellanic Cloud and the Small Magellanic Cloud.
[Pictured: Small Magellanic Cloud galaxy captured by NASA's Great Observatories.]
NASAUnderstanding Magellanic clouds has become a propelling source of understanding distant galaxies. They consist of two irregular galaxies that orbit the Milky Way. Orbiting about 200,000 light-years away, the Magellanic clouds are formed by the Large Magellanic Cloud and the Small Magellanic Cloud.
[Pictured: Small Magellanic Cloud galaxy captured by NASA's Great Observatories.]
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50 space terms for understanding the universeNASA
Magnitude refers to a mathematical measurement for something's size or extent in comparison to other similar objects. In astronomy, magnitude is a unitless system used to measure the varying degrees of brightness of objects in the sky. Greek astronomer Hipparchus introduced the concept of magnitude for classifying stars in 129 B.C., referring to the brightest stars in the sky as "first magnitude."
[Pictured: This is a low-resolution version of the skymap. The threshold magnitude is 3.0 so the Milky Way is very faint.]
NASAMagnitude refers to a mathematical measurement for something's size or extent in comparison to other similar objects. In astronomy, magnitude is a unitless system used to measure the varying degrees of brightness of objects in the sky. Greek astronomer Hipparchus introduced the concept of magnitude for classifying stars in 129 B.C., referring to the brightest stars in the sky as "first magnitude."
[Pictured: This is a low-resolution version of the skymap. The threshold magnitude is 3.0 so the Milky Way is very faint.]
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50 space terms for understanding the universeNavicore // Wikimedia Commons
A meteor is a rocky object or asteroid that vaporizes when entering the Earth’s atmosphere. They’re often called “shooting stars” and provide a beautiful glowing tail as they enter the atmosphere. Next time you see one, be sure to make a wish upon a meteor!
[Pictured: A meteor during the Leonid meteor shower.]
Navicore // Wikimedia CommonsA meteor is a rocky object or asteroid that vaporizes when entering the Earth’s atmosphere. They’re often called “shooting stars” and provide a beautiful glowing tail as they enter the atmosphere. Next time you see one, be sure to make a wish upon a meteor!
[Pictured: A meteor during the Leonid meteor shower.]
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50 space terms for understanding the universeNASA
The Earth’s galactic home, the Milky Way is a spiral galaxy that is constantly rotating. The Milky Way contains a high amount of dust and gas wrapped around the central galactic bulge. The galactic bulge contains a dense amount of dust, gas and stars. And within that bulge, exists a large black hole (see slide #8). Our solar system lies about 30,000 light-years from the galaxy’s center.
[Pictured: The Milky Way captured by NASA's Spitzer Space Telescope.]
NASAThe Earth’s galactic home, the Milky Way is a spiral galaxy that is constantly rotating. The Milky Way contains a high amount of dust and gas wrapped around the central galactic bulge. The galactic bulge contains a dense amount of dust, gas and stars. And within that bulge, exists a large black hole (see slide #8). Our solar system lies about 30,000 light-years from the galaxy’s center.
[Pictured: The Milky Way captured by NASA's Spitzer Space Telescope.]
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50 space terms for understanding the universeNASA
The moon is a heavenly body that orbits the Earth and happens to be the easiest object to spot in the night sky. As the moon orbits our planet, we see it go through “phases,” where at different times different proportions of the moon’s surface are visible. These phases have guided time since the beginning of humanity. The calendar month roughly replicates the moon’s orbit of the Earth.
[Pictured: Moon's north pole assembled from 18 images captured by Galileo's imaging system.]
NASAThe moon is a heavenly body that orbits the Earth and happens to be the easiest object to spot in the night sky. As the moon orbits our planet, we see it go through “phases,” where at different times different proportions of the moon’s surface are visible. These phases have guided time since the beginning of humanity. The calendar month roughly replicates the moon’s orbit of the Earth.
[Pictured: Moon's north pole assembled from 18 images captured by Galileo's imaging system.]
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50 space terms for understanding the universeNASA
A nebula is a large cloud of dust and gas in space that is produced when a star dies. The gas and dust eventually clump together into a mass large enough to form its own gravity. Nebulae can also be places for new stars to form and are sometimes referred to as “star nurseries.”
[Pictured: The Seagull nebula.]
NASAA nebula is a large cloud of dust and gas in space that is produced when a star dies. The gas and dust eventually clump together into a mass large enough to form its own gravity. Nebulae can also be places for new stars to form and are sometimes referred to as “star nurseries.”
[Pictured: The Seagull nebula.]
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50 space terms for understanding the universeInternet Archive Book Images // Wikimedia Commons
The Nebular hypothesis is the most widely accepted theory of how our solar system was born. The theory itself was born during the Scientific Revolution from the 16th to18th centuries. The theory’s essence states that our solar system was birthed from a nebula billions of years ago. The theory has also been applied to how all stars came to be.
[Pictured: The nebular hypothesis of Laplace, 1882.]
Internet Archive Book Images // Wikimedia CommonsThe Nebular hypothesis is the most widely accepted theory of how our solar system was born. The theory itself was born during the Scientific Revolution from the 16th to18th centuries. The theory’s essence states that our solar system was birthed from a nebula billions of years ago. The theory has also been applied to how all stars came to be.
[Pictured: The nebular hypothesis of Laplace, 1882.]
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50 space terms for understanding the universeCasey Reed - Penn State University // Wikimedia Commons
Neutron stars are small, but very dense objects that are birthed by the explosive death of a giant star. Neutron stars can exist in two states. The first is a pulsar, which emits a narrow radiation beam. The second is a magnetar, which has a powerful magnetic field that has the force to distort atoms.
[Pictured: Artist's illustration of an 'isolated neutron star.']
Casey Reed - Penn State University // Wikimedia CommonsNeutron stars are small, but very dense objects that are birthed by the explosive death of a giant star. Neutron stars can exist in two states. The first is a pulsar, which emits a narrow radiation beam. The second is a magnetar, which has a powerful magnetic field that has the force to distort atoms.
[Pictured: Artist's illustration of an 'isolated neutron star.']
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50 space terms for understanding the universeNASA
Named after astronomer Jan Oort whose theory about a cloud comprising a shell of icy objects existing beyond the Kuiper Belt, or the region that exists in our solar system beyond Neptune, could be responsible for the long-term comets visible from Earth (like Halley’s). The cloud is theorized to comprise the remains of disc materials of planets and the sun.
[Pictured: This artist's concept puts solar system distances in perspective.]
NASANamed after astronomer Jan Oort whose theory about a cloud comprising a shell of icy objects existing beyond the Kuiper Belt, or the region that exists in our solar system beyond Neptune, could be responsible for the long-term comets visible from Earth (like Halley’s). The cloud is theorized to comprise the remains of disc materials of planets and the sun.
[Pictured: This artist's concept puts solar system distances in perspective.]
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50 space terms for understanding the universeNASA // Wikimedia Commons
In short, an orbit is the gravitationally curved trajectory of an object in space. In other words, an orbit is the circular motion in which objects in space travel due to gravity’s pull. For example, the moon orbits around the Earth and the Earth orbits around the sun in a circular motion. An object that orbits another is called its satellite.
[Pictured: The International Space Station orbits above Earth.]
NASA // Wikimedia CommonsIn short, an orbit is the gravitationally curved trajectory of an object in space. In other words, an orbit is the circular motion in which objects in space travel due to gravity’s pull. For example, the moon orbits around the Earth and the Earth orbits around the sun in a circular motion. An object that orbits another is called its satellite.
[Pictured: The International Space Station orbits above Earth.]
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50 space terms for understanding the universeNASA
Measuring using parallax involves estimating the distance of nearby celestial objects by measuring movement against more distant celestial objects. This method is often used when measuring distances of neighboring stars, called stellar parallax.
[Pictured: Artist's concept of parallax.]
NASAMeasuring using parallax involves estimating the distance of nearby celestial objects by measuring movement against more distant celestial objects. This method is often used when measuring distances of neighboring stars, called stellar parallax.
[Pictured: Artist's concept of parallax.]
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50 space terms for understanding the universeNASA
Quasars are large distant objects in space that are powered by large, powerful black holes. They tend to shine so brightly that their light eclipses the old galaxies that they exist within. They are capable of emitting thousands of times more energy than the Milky Way emits.
[Pictured: Artist's concept of a quasar.]
NASAQuasars are large distant objects in space that are powered by large, powerful black holes. They tend to shine so brightly that their light eclipses the old galaxies that they exist within. They are capable of emitting thousands of times more energy than the Milky Way emits.
[Pictured: Artist's concept of a quasar.]
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50 space terms for understanding the universeNASA
A red giant is a star that is reaching its final days and approaching death. If a star has turned into a red giant, the star is in the last states of its stellar evolution and expands. Our own sun will eventually expand and turn into a red giant—but not for a few billion years.
[Pictured: Image shows the "bow shock" of a dying star named R Hydrae, or R Hya, in the constellation Hydra.]
NASAA red giant is a star that is reaching its final days and approaching death. If a star has turned into a red giant, the star is in the last states of its stellar evolution and expands. Our own sun will eventually expand and turn into a red giant—but not for a few billion years.
[Pictured: Image shows the "bow shock" of a dying star named R Hydrae, or R Hya, in the constellation Hydra.]
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50 space terms for understanding the universeNASA
Red shift and blue shift explain how light changes wavelength as objects in space move closer or farther from each other. As an object moves away from us, the light is shifted towards the red end of the color spectrum. In turn, as it moves closer, the light shifts towards the blue end of the spectrum. Along with blue shift, red shift is hugely valuable in understanding the universe’s expansion.
[Pictured: Image of what could be the most distant galaxy ever seen. The small galaxy's starlight has been stretched into longer wavelengths, or "redshifted," by the expansion of the universe.]
NASARed shift and blue shift explain how light changes wavelength as objects in space move closer or farther from each other. As an object moves away from us, the light is shifted towards the red end of the color spectrum. In turn, as it moves closer, the light shifts towards the blue end of the spectrum. Along with blue shift, red shift is hugely valuable in understanding the universe’s expansion.
[Pictured: Image of what could be the most distant galaxy ever seen. The small galaxy's starlight has been stretched into longer wavelengths, or "redshifted," by the expansion of the universe.]
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50 space terms for understanding the universeNASA
A solar system is a gravitationally bound system of a sun and the objects that orbit it. That includes the bodies that orbit the objects orbiting the sun. For example, our solar system contains the sun, the planets that orbit it, as well as moons and other objects that orbit them.
[Pictured: Stylized rendition of our solar system.]
NASAA solar system is a gravitationally bound system of a sun and the objects that orbit it. That includes the bodies that orbit the objects orbiting the sun. For example, our solar system contains the sun, the planets that orbit it, as well as moons and other objects that orbit them.
[Pictured: Stylized rendition of our solar system.]
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50 space terms for understanding the universeNASA
Solar wind is a wind streaming solar particles and plasma from the sun. As a solar wind carries charged particles from the sun towards the Earth could have catastrophic effects for Earth’s habitants. But don’t worry, Earth’s magnetic field provides a pretty sturdy shield against any of these negative effects.
[Pictured: Conditions observed by NASA's Cassini spacecraft during a flyby depicting solar wind on Titan.]
NASASolar wind is a wind streaming solar particles and plasma from the sun. As a solar wind carries charged particles from the sun towards the Earth could have catastrophic effects for Earth’s habitants. But don’t worry, Earth’s magnetic field provides a pretty sturdy shield against any of these negative effects.
[Pictured: Conditions observed by NASA's Cassini spacecraft during a flyby depicting solar wind on Titan.]
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50 space terms for understanding the universeCreative Commons // Wikimedia Commons
Sometimes referred to as the “noodle effect,” Spaghettification is when the extreme tidal forces stretch out objects to be long and thin like a noodle. This effect can also be caused by the immense gravitational pull of a black hole.
[Pictured: Illustration showing what spaghettification will do to an astronaut entering a small black hole's event horizon.]
Creative Commons // Wikimedia CommonsSometimes referred to as the “noodle effect,” Spaghettification is when the extreme tidal forces stretch out objects to be long and thin like a noodle. This effect can also be caused by the immense gravitational pull of a black hole.
[Pictured: Illustration showing what spaghettification will do to an astronaut entering a small black hole's event horizon.]
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50 space terms for understanding the universeNASA
Other than serving as beautiful guiding lights in our sky, stars are astronomical objects that are composed of gas that pulls itself together with its own gravitational pull. Nuclear fusion at the star’s core creates the light that stars emit.
[Pictured: Star from the Lizard constellation.]
NASAOther than serving as beautiful guiding lights in our sky, stars are astronomical objects that are composed of gas that pulls itself together with its own gravitational pull. Nuclear fusion at the star’s core creates the light that stars emit.
[Pictured: Star from the Lizard constellation.]
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50 space terms for understanding the universeNASA
In the same way that planets can be gravitationally bound to the sun, causing them to orbit it, stars can also cluster together due to gravity. Two types of star clusters can be determined: globular clusters and open clusters. Globular clusters are tight clusters of thousands of older stars, whereas open clusters are made up of a few hundred very young stars.
NASAIn the same way that planets can be gravitationally bound to the sun, causing them to orbit it, stars can also cluster together due to gravity. Two types of star clusters can be determined: globular clusters and open clusters. Globular clusters are tight clusters of thousands of older stars, whereas open clusters are made up of a few hundred very young stars.
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50 space terms for understanding the universeNASA
A supernova is the largest explosion that can be seen with the human eye. A supernova occurs as the last step of a dying massive star that emits an extremely bright light. This occurs in the death of a star at least five times the mass of our solar system’s sun.
[Pictured: Data combined from four different space telescopes to create a multi-wavelength view of a supernova called RCW 86.]
NASAA supernova is the largest explosion that can be seen with the human eye. A supernova occurs as the last step of a dying massive star that emits an extremely bright light. This occurs in the death of a star at least five times the mass of our solar system’s sun.
[Pictured: Data combined from four different space telescopes to create a multi-wavelength view of a supernova called RCW 86.]
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50 space terms for understanding the universeRuffnax // Wikipedia
A telescope is the signature tool of astronomers to see far objects out in space in further detail. Today, telescopes are designed with curved mirrors that gather light from the sky and concentrates it so that far away objects are visible.
[Pictured: The Hubble Space Telescope as seen from the departing Space Shuttle Atlantis.]
Ruffnax // WikipediaA telescope is the signature tool of astronomers to see far objects out in space in further detail. Today, telescopes are designed with curved mirrors that gather light from the sky and concentrates it so that far away objects are visible.
[Pictured: The Hubble Space Telescope as seen from the departing Space Shuttle Atlantis.]
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50 space terms for understanding the universePublic Domain // Wikimedia Commons
The theory of relativity was developed by Albert Einstein in 1905 and includes both theories of special relativity and general relativity. The theory determines that the laws of physics are the same for all non-accelerating observers and was monumental in introducing a framework for space and time.
Public Domain // Wikimedia CommonsThe theory of relativity was developed by Albert Einstein in 1905 and includes both theories of special relativity and general relativity. The theory determines that the laws of physics are the same for all non-accelerating observers and was monumental in introducing a framework for space and time.
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50 space terms for understanding the universeLookang // Wikimedia Commons
Tides are the rise and fall of sea level that is caused by the gravitational pull of the moon and the sun. They are one of the most reliable phenomena in the world. The difference between high and low tide is called the tidal range.
Lookang // Wikimedia CommonsTides are the rise and fall of sea level that is caused by the gravitational pull of the moon and the sun. They are one of the most reliable phenomena in the world. The difference between high and low tide is called the tidal range.
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50 space terms for understanding the universeNASA
A white dwarf is a relatively small star that is about the size of a planet that is very dense. It is essentially a star that has exhausted all of its nuclear fuel from within. It expels most of its outer material, leaving a white-hot core that cools over the next billion years.
[Pictured: NGC 7293, better known as the Helix nebula. The core of the star is a small, hot, dense remnant known as a white dwarf.]
NASAA white dwarf is a relatively small star that is about the size of a planet that is very dense. It is essentially a star that has exhausted all of its nuclear fuel from within. It expels most of its outer material, leaving a white-hot core that cools over the next billion years.
[Pictured: NGC 7293, better known as the Helix nebula. The core of the star is a small, hot, dense remnant known as a white dwarf.]
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50 space terms for understanding the universeNASA
And lastly, we have landed at the universe. A loaded definition that has flummoxed scientists for generations, a universe contains billions of galaxies and even more stars along with their planets, moons, asteroids, comets, dust, and gas, all of which exists swirling around in the massive thing we call space.
[Pictured: Deep space images ever captured by the Hubble.]
You may also like: Can you answer these real 'Jeopardy!' questions about space?
NASAAnd lastly, we have landed at the universe. A loaded definition that has flummoxed scientists for generations, a universe contains billions of galaxies and even more stars along with their planets, moons, asteroids, comets, dust, and gas, all of which exists swirling around in the massive thing we call space.
[Pictured: Deep space images ever captured by the Hubble.]
You may also like: Can you answer these real 'Jeopardy!' questions about space?