ScienceCast: Did Earth Have Two Moons?

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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Comment by Ted E Bear on September 22, 2011 at 11:47pm
Hypothesis? Earth still has a second moon called Cruithne. The problem is that astronomers are still trying to define what a moon is because it could includes several other small objects.

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