What would happen if the sun was replaced by a black hole?

If it is replaced by a same mass black hole nothing would change, however, if we replaced it with a same sized black hole means that the event horizon radius is the same radius of the sun and a black hole with such a radius it's mass is about 460000 solar masses (4600000 times mass of the sun) so the gravitational pull of the planets would be tremendous, I wouldn't assume that we would survive such a change in gravity. read more

Black holes are just about the strangest objects in the universe. They are regions of space where gravity is so powerful that even light can't escape. read more