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2015-09-29T13:31:30+08:00
Comet.
asteroids can visit the earth but the chances are very small

hope that helped!

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2015-09-29T17:05:48+08:00

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An asteroid because it has a shorter orbital period and it's origin is most likely from the Asteroid Belt which is nearer than the Oort Cloud and Kuiper Belt.

--Mizu
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