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.
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.