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NASA's GRAIL mission started its lunar probe late in 2011 to uncover some of the mysteries buried beneath the surface of the Moon --even, perhaps, a long-lost companion. According to recent scientific speculation, the Earth once had two moons gracing our night skies.

"It's an intriguing idea," said David Smith, GRAIL's deputy principal investigator at MIT. "And it would be a way to explain one of the great perplexities of the Earth-Moon system – the Moon's strangely asymmetrical nature. Its near and far sides are substantially different.".