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Mystery sand ripples on Mars explained

Posted: 11/4/2008 12:00:00 AM   Reads: 519   Submitted By:0x6a656666   Category: Mars Anomalies   Source: www.msnbc.msn.com
The nature of strange ripples of sand on the Martian surface is clearer now thanks to pole-to-pole images returned by a NASA spacecraft. But even with this new information, scientists still are unsure just how the features, which are unlike anything on Earth, came to be.
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