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With many new planet discoveries being hot Jupiters, is it possible that Mercury is the leftover core of a gas giant?

Patrick Clough, Wichita, Kansas
Hot Jupiter
Many of the known extrasolar planets are "hot Jupiters," gas giants that orbit very close to their host suns.
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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