Question

One "extreme" example of gravity is a black hole. What would happen to the Earth's orbit if the Sun was suddenly replaced by a black hole of the same mass? Why? (Please ignore any processes that the Earth would experience during the formation of the black hole.) Please break it down for us dummies

Answer 1

if the sun turns into a black hole of the same size, it will have certainly devastating effects in our solar system. especially on the life of earth and other planets of the solar system, if they have any. but not in the context of gravitation.

the first thought comes in mind when we think about as given that it (black hole) will submerge the earth completely in itself because of black holes have a tremendous gravitational force. but the reality is even after turning the sun into a black hole, the amount of gravity will not be greater than it has now. the reason is it will not have certainly more amount of matter than now, which is the reason for the gravitation force (matter) & as given in the question, the amount of the mass is same. not matters, whether it is a black hole or a shepherd well-distributed mass.

so all planet including our earth will be in its orbital path as before. the center of mass and amount of mass is the same before even after replacing it with a black hole.

now apart gravity, there will certainly very destructive result will appear before mankind as the very low temperature in which life can't survive without any back, our whole solar system will dip into the darkness & many more. no energy, no light so then no life.