Why Pluto rolled over http://nyti.ms/2fW0rcb
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On earth, bulges on both sides have the same density. Not so on Pluto. Imagine a lead weight glued to a ping pong ball.
1. Imagine weight starts at far side of Pluto. Then try to rotate it to move it to position under Charon.
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2. As soon as it moves, it's offset, and there's a gravitational force trying to pull back to where it started.
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We could do the math if you want.
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