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19 Cards in this Set
- Front
- Back
Orbit
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curved path of one object around another object in space
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Nebula
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cloud of gas and dust in space
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solar system
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The Sun and all objects that orbit it.
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Ellipse
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flattened circle, or oval
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perihelion
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point at which a planet is closest to the Sun
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Aphelion
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point at which a planet is farthest from the sun
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Mare
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broad, flat plain on the Moon's surface
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crater
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Round hole on the Moon's surface.
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Satellite
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natural or artificial object orbiting another body in space
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Rift
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valley caused by a crack in the crust of a planet
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Asteroid
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large chunk of rock or metal that orbits the Sun
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Meteoroid
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small piece of rock or metal that travels through space
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Meteorite
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piece of rock or metal that falls on a planet or moon's surface
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meteor
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Rock or metal that enters Earth's atmosphere.
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Dwarf planets
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small, planetlike objects that orbit the Sun and share their orbits with similar objects
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Comet
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lump of ice, frozen gas, and dust that orbits the sun
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Tail
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long, ribbonlike trail of comet dust and gas
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Coma
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gas cloud that surrounds the nucleus of a comet
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nucleus
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Head or solid part of a comet.
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