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Science O.A.A. Review!!!!!:(

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Asteroid
a piece of rock or metal made up of material similar to that which formed the planets; mostly found in the asteroid belt between the orbits of Mars and Jupiter
Comet
(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit
Light-Year
About 9.5 million km- the distance that light travels in one year; used to measure large distances between stars or galaxies.