ScienceCasts: Did Earth Have Two Moons?

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Learn more about the formation of Earth's moon: https://science.nasa.gov/moon/formation/?utm_source=science&utm_medium=youtube&utm_campaign=2026 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.

Published 2011-09-22 · Watch on YouTube ↗
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