The Moon Is Shrinking and Expanding

In 2010, researchers discovered that the moon has been contracting over time. The shrinkage is making the moon shrivel like a raisin, creating features called wrinkle ridges all over its surface. That shrivelling makes sense, because the moon's interior should be gradually contracting as it loses the heat from its violent formation more than 4 billion years ago. Similar wrinkles have been found on Mercury.  

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