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Lunar Gravity Mystery Solved?
June 2, 2013 | NASA

NASA’s GRAIL mission has solved one of the mysteries of the Moon. “Why is the Moon’s gravity is uneven?… It appears that asteroid impacts have created patches of very high density rock in the subsurface.


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Crustal Thickness Map of the Moon
November 12, 2013 | NASA
"Global map of crustal thickness of the moon derived from gravity data obtained by NASA's GRAIL spacecraft. The lunar near side is represented on the left hemisphere. The far side is represented in the right hemisphere."

Missing-Mantle Mystery
July 21, 2013 | MIT
"But there remains one lingering mystery: If the Earth arose from the collision of asteroids, its composition should resemble that of meteoroids, the small particles that break off from asteroids. But to date, scientists have found that, quite literally, something doesn’t add up: Namely, the Earth’s mantle — the layer between the planet’s crust and core — is missing an amount of lead found in meteorites whose composition has been analyzed following impact with the Earth." Quoted from the MIT press release. Related: What is the Moho?


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