What are the physics concerning black holes?

I have heard two things about black holes:





1. Anything that enters is stretched or forced into a thin paste and comes out in a different universe or something.





2. Anything tat enters is smooshed or compressed and then the remains are pushed out of the sides of the black hole in the form of dust or some kind of matter.





What I want to know, what happens to the remains of something when it goes into a black hole?|||1. You'd get stretched out as you fell in because the gravity of a black hole is so intense that if you fell in feet first, your feet would experience a greater pull than your head. But no, you don't come out in another universe. A black hole isn't an actual hole in space; it doesn't go anywhere. It's just a really dense dead star.





2. You'd get squished when you finally reached the surface (if you ever did) and become part of the probably-degenerate matter that makes up the black hole. No, you don't get pushed out the sides in any form. Once you fall in, you're in there for good. Sometimes you see hot gas and light streaming away from a black hole, but only because it never got close enough to fall in.|||A black hole is predicted by Einstein's general relativity. Black holes are an amount of mass infinitely compacted into a point in spacetime with deminsions of 0. The gravity is so strong light cannot escape it, that is why everything goes black after a certain point known as the event horizon. After this point we can not be certain what happens to something falling twoard the center. Some speculate that since the part closest to the center is moving faster than the part of the object farthes away, the object will split in half--it will continue splitting in half untill it is a long string of particles(this process is known as spaghettification, no joke) and they will eventually collide with the center becming part of the infinitely small black hole.|||If something enters it is streched because the force per unit mass of is feet is considerably greater than the force per unit mass of its head- so the force difference streches it.





Not much is known when you hit the singularity- which you will with certainty in a fixed time. In terms of quantum mechanics, the state of you plus the black hol before you hit the centre must be the state after, and in some sense the information about you is still preserved in the black hole. This is a hot theoretical subject where relativity confronts quantum mechanics, and no-one knows who wins.





Look up: "black hole information paradox" for more on this.|||Read "Death by Blackhole" by the astronomer Neil Degrasse Tyson. He explains it very well.





Yes, you get stretched and eventually ripped apart - first into two segments, then four, then eight, 16, 32, 64 and so on, all the way down to individual subatomic particles.