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19 Cards in this Set
- Front
- Back
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A, large glowing ball of gas that generates heat and light through nuclear fusion in its core.
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STAR
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A, moderately large object that orbits a star and shines primarily by reflecting light from its star.
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PLANET
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An object that orbits a planet.
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MOON(or satellite)
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A relatively small and rocky object that orbits a star and are officially considered part of a category known as "small solar system bodies."
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ASTEROID
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A relatively small and ice-rich object that orbits a star.
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COMET
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The Sun and all the material that orbit it, including the planets.
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SOLAR SYSTEM
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A star(sometimes more than one star) and any planets and other materials that orbit it.
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STAR SYSTEM
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A great island of stars in space, containing to a few hundred million to a trillion or more stars, all held together by gravity and orbiting a common center.
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GALAXY
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A collection of galaxies bound together by gravity. Small collections(up to a few dozen galaxies) are generally called groups, while larger collections are called clusters.
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CLUSTER OF GALAXIES
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A gigantic region of space where many individual galaxies and many groups and clusters of galaxies are packed more closely together than elsewhere in the universe.
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SUPERCLUSTER
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The sum total of all matter and energy-that is, all galaxies and everything between them.
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UNIVERSE(or COSMOS)
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The portion of the entire universe that can be seen from Earth, at least in principle.
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OBSERVABLE UNIVERSE
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The average distance between Earth and the Sun, which is about 150 million kilometers.
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ASTRONOMICAL UNIT(AU)
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The distance that a light can travel in 1 year, which is about 9.46 trillion kilometers.
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LIGHT-YEAR
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The spinning of an object around its axis.
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ROTATION
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The orbital motion of one object around another.
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ORBIT
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The increase in the average distance between galaxies as time progresses.
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EXPANSION(of the universe)
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The orbital motion of one object around another.
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ORBIT
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The increase in the average distance between galaxies as time progresses.
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EXPANSION(of the universe)
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