> everything near where it "touched down" would experience near zero-g as it approached[...] while the black hole was inside the earth, everything would be expe

> everything near where it "touched down" would experience near zero-g as it approached[...] while the black hole was inside the earth, everything would be experiencing close to 2G, then zero G for a bit for the poor souls on the side of the earth where it exited. All of these numbers are off by many orders of magnitude. You're fundamentally misunderstanding how gravity works. If you were standing on the surface of the Earth and an Earth-mass black hole were magically stationary 1 km underneath your feet you wouldn't experience something close to 2G, you'd experience something closer to 40 million G. Check out [1] for more details, and [2] for a calculator where you can play with the gravitational formula. 1. http://www.physbot.co.uk/gravity-fields-and-potentials.html http://www.physbot.co.uk/gravity-fields-and-potentials.html 2. https://www.wolframalpha.com/input/?i=surface+gravity+calculator https://www.wolframalpha.com/input/?i=surface+gravity+calcul...