The Earth has been whacked by big space rocks in the past.

过去地球已经多次受到大型空间陨石的打击。

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And for those who want to learn about their space rocks on the go, a Twitter feed is offered.

对那些想了解更多有关飞行中的太空岩石的人，网站提供了一个Twitter feed。

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Both are designed to survey wide swaths of the sky and could spot far more of the small space rocks.

二者都是专门用来巡视广袤天穹，搜寻小体积的太空陨石。

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Was water brought to the moon by space rocks and icy bodies called comets?

VOA: special.2009.12.30

Amino acids have already been found in space rocks called meteorites.

VOA: special.2009.09.30

Just as I am leaving, Pitt guides me out of earshot from the kids swirling around the space rocks.

FORBES: The Largest Meteorite Auction Ever

The Wise telescope instead looks at the infrared light emitted from space rocks, which is related to the temperature of the object.

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So far they have counted more than 9, 000 near-Earth asteroids, and they spot another 800 new space rocks on average each year.

BBC: Apophis asteroid: Large space rock flies past Earth