A comet the size of a small mountain and about as solid as a pile of talcum powder whizzed past Mars.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/b1sfRiF8xyI" height="1" width="1"/>
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A comet the size of a small mountain and about as solid as a pile of talcum powder whizzed past Mars.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/b1sfRiF8xyI" height="1" width="1"/>