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GRAIL and the Mystery of the Missing Moon

Subject: GRAIL and the Mystery of the Missing Moon
From: NASA Science News <snglist@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 07 Sep 2011 19:38:37 -0500

NASA Science News for Sept. 7, 2011

Did our planet once have two moons? Some researchers say so. Moreover, the missing satellite might still be up there--splattered against the far side of the Moon. NASA's GRAIL mission, due to launch on Sept. 8th, could help confirm or refute the "two moon" hypothesis.

FULL STORY at

http://science.nasa.gov/science-news/science-at-nasa/2011/07sep_twomoons/

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