Asteroids: Visitors from Afar

[riky]

Asteroids: Visitors from Afar

<img alt="" src="http://media-3.web.britannica.com/eb-media//15/143215-050-CEC66CE8.jpg" width="270" height="267" align="right" />Why do NASA scientists keep such close eye on asteroids as they travel near Earth? Because asteroids, though mostly small, have had surprisingly large effects on the history of our planet. Step inside for more.

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