ScienceCasts: Did Earth Have Two Moons?
By Science@NASAFrom vimeo.com
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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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Origins
Lunar Gravity
Farside of the Moon
GRAIL
Science Mission Directorate
SMD
ScienceCasts
NASA
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