What is the history behind black holes?

 Well, as far as this universe is concerned, it is a singularity that's "behind" a black hole, but in all truth, "Behind" really IS "inside." Gravity is a direction that points outside the universe into another dimension. Gravity is a curviature of space-time, and since we're always in space, you can't look or point in the actual direction space is being bent. 

From a 3d space perspective, there's more space behind the black hole. You can come at it from any angle just as you would a planet or star. The "hole" leads down to a point in space that is infinitely compressed - infinitely dense; basically, a shrinking down to nothingness. You can't see the singularity, because it is surrounded by the event horizon - the point-of-no-return where gravity becomes so strong that even light cannot escape. This could be considered the "surface" of the black hole, but whatever is inside of it, besides saying that it's a singularity, nobody can really say for certain because it's impossible to observe with our knowledge of science.   hope that helped

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