I'm not sure if I'm posting in the right forum, or if you'll indulge a little mind experiment likely completely outside the possibilities of physics. Say something on earth suddenly became incredibly massive, going in seconds from the density of a human body to a density of a planetary body while remaining the size of a human body. How would such a thing behave? Would it be drawn into orbit around the earth? Would it turn into a black hole or some theoretical phenomenon? Obviously, this is just for fun and there is no right answer. I am curious if there's a general consensus, though. Thanks for indulging me!