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ScienceCasts: Did Earth Have Two Moons?

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Uploaded on Sep 22, 2011

Visit http://science.nasa.gov/science-news/... for the full story.

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

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