This is a video talking about a travel to black hole. We can make black hole mathematically if we can make everything around us that is known as schwardschild radius, small enough to have infinite density. The back hole is in the same way. For example if you small Everest small to about a NANO meter or Everest to about a peanut. But fortunately there is no way to do that fashion. But in the space, when a very large star, very larger than our sun, exist, it is a source of fuel but when it run out of fuel it cannot keep hot enough and become small.