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1 .This is Scientific American 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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2 .The dark side of the moon.
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3 .It's remote and mysterious.
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4 .And not just because we can't see it from Earth.
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5 .When viewed from space, the moon's back side looks totally different from its front.
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6 .Now, researchers think they have a solution to the mystery, which they share in the Astrophysical Journal Letters.
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7 .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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8 .But scientists wonder why the far side doesn't have comparable features.
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9 .According to the new analysis, this asymmetry has to do with how the moon was made.
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10 .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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11 .The crash left both bodies boiling hot.
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12 .But the smaller moon cooled down more quickly than the molten Earth¡ especially the part that faced the other way.
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13 .The minerals on the moon's cooler side started to precipitate sooner.
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14 .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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15 .Even on the moon.
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16 .Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.
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