No one predicted Mercury would be a planetary core with the mantle stripped off. No one predicted volcanoes on the Jovian moons, or oceans on the inside of them. I can tell you, for every single planet, huge 'we never guessed that' things.

Alan Stern

Alan Stern

Core Every Huge I Can Inside Mantle Mercury Never Oceans Off Planet Planetary Predicted Single Stripped Tell Them Things Would You

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