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This is Scientific American 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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The dark side of the moon.

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It's remote and mysterious.

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And not just because we can't see it from Earth.

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When viewed from space, the moon's back side looks totally different from its front.

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Now, researchers think they have a solution to the mystery, which they share in the Astrophysical Journal Letters.

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You may have wondered about the Man in the Moon, that face-like image made by the large flat plains on the lunar surface that faces us.

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But scientists wonder why the far side doesn't have comparable features.

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According to the new analysis, this asymmetry has to do with how the moon was made.

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Not long after the Earth formed, a Mars-sized hunk of intergalactic debris smacked into our baby planet, flinging off material that then became the moon.

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The crash left both bodies boiling hot.

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But the smaller moon cooled down more quickly than the molten Earth¡ especially the part that faced the other way.

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The minerals on the moon's cooler side started to precipitate sooner.

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That head start gave the far side a thicker crust, which is more resistant to the weathering seen on the familiar side: weathering that gives a face character.

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Even on the moon.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.

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