Every Black Hole vs. the Same City

The same city. Eight black holes, from one smaller than a proton to TON 618, a monster whose horizon could swallow the solar system 27 times over. Watch what each one does to the city, and why the answer is the opposite of what you would expect. The smallest one cracks a single window. A marble-sized one with the mass of the Earth makes everything fall up. And the biggest ones swallow the whole city without breaking a thing. Which one surprised you the most? Tell me in the comments. CHAPTERS 0:00 A primordial black hole · as heavy as a mountain 0:54 A Moon-mass black hole · a grain of sand 1:51 An Earth-mass black hole · the size of a marble 2:45 A Sun-mass black hole · 6 km across 3:41 Cygnus X-1 · 21 suns 4:39 Sagittarius A* · the centre of the Milky Way 5:59 M87* · the first black hole ever photographed 6:55 TON 618 · one of the largest ever found Why do the biggest black holes do the least damage? Tidal forces. What tears things apart is not how hard gravity pulls, but how much harder it pulls on your feet than on your head. Near a small black hole that difference is enormous, so it shreds planets from far away. At the horizon of a supermassive one it is gentler than the Moon's tides, so a whole city can cross it intact. It just can never come back. Masses, sizes and tidal forces follow general relativity (Schwarzschild black holes, no spin). The sky is ray-traced through the bent spacetime around each hole. Primordial, Moon-mass and Earth-mass black holes are hypothetical; Cygnus X-1, Sagittarius A*, M87* and TON 618 are real. The city is fictional and some timings are compressed so you can watch them. The Grey Tide makes 3D simulations of history and science. #blackhole #space #physics #simulation