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Planets - planets is a celestial bodies. some are made up of rocks and some are gases . there are 8 planets -mercury , venus , earth , mars are rocks . Jupiter saturn uranus and neptune are gases
Asteroids -Asteroids are minor planets, especially those of the inner Solar System. The larger ones have also been called planetoids. 
meteorids-it is rock substance which revolve around sun.
meteors-meteor also known as a "shooting star" or "falling star",

hope it is helpful
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