NASA/Greg Bacon (STScI/AVL)
Mercury is not a leftover core of a gas giant planet. Although extrasolar systems have revised the planet formation rulebook, we still think gas giants form far from their stars, about as far as Jupiter is from ours.
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Mercury is not a leftover core of a gas giant planet. Although extrasolar systems have revised the planet formation rulebook, we still think gas giants form far from their stars, about as far as Jupiter is from ours.