August 03, 2011
A Spare Moon

Scientists have developed a new theory to explain why the near and far sides of the moon are so different: it may be that another, smaller moon slowly collided with the larger body billions of years ago. It's hoped that two upcoming NASA missions (GRAIL and LRO) will provide data for the tests needed to confirm, or deny, this new idea.

Posted by scott at August 03, 2011 01:47 PM

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