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CH21- L1-4

CH21- L1-3

TermDefinition
asteroid millions if small rocky objects
comet gas dust and ice that moves around the sun in an oval-shaped orbit
astronomical unit the average distance between the earth and sun
period of revolution the time a planet takes to orbit around the sun
period of rotation the time it takes a planet to complete one rotation
terrestrial planet the planets that are closest to the sun
greenhouse effect the atmosphere traps solar energy.
Galilean moons made of rock and ice. other planets moons
meteoroid A small rocky particle floating through space
meteor is meteoroid that is in earth's atmosphere
meteorite that strikes something
impact crator a round depression
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