yea, a freakin planet!
what does this all mean?
"Scientists had theorized that as the core of Mercury cools, it contracts and the whole planet shrinks. That was even a 19th Century theory for why Earth had mountains, but one that later proven wrong, Solomon said. But with Mercury that seems to be the case. As the planet shrinks, a bit of crust is pushed over another, forming what Prockter calls "wrinkle ridges."
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