ScienceCast 29: Did Earth Have Two Moons?

What this episode covers

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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How long is this episode of NASA ScienceCasts?

This episode is 3 minutes long.

When was this NASA ScienceCasts episode published?

This episode was published on September 22, 2011.

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