The Universe, Laws of Motion, Light, and Telescopes
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Last updated 8:08 AM on 2/22/26
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13 Terms
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Parts of the Universe
Galaxies, nebulae, stars, planets, dwarf planets, moons, asteroids, comets
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Galaxy
Self-gravitating gas cloud
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Nebula
Gas cloud
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Planet
Spheroidal object that orbits a sun
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Moon
Spheroidal object that orbits a planet
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Asteroid
Nonspheroidal object that orbits a planet
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Comet
Asteroidlike object with generally high water content and the ability to develop a tail
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Size of the observable Universe
13.7 billion light years
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Age of the Universe
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