It's all relative
And we ain't got a rocket that can reach one of them, never mind get itself out of the space beyond the event horizon.
Actually the General Theory of Relativity by Einstein falls over at the point of a singularity of a black hole. It's too small but has humongous mass - his theory predicts it to be infinitesimally small with infinite mass at that point.
There are moves afoot to see if Quantum mechanics can be merged with Einsteins general theory of relativity in a theory called quantum gravity - since quantum mechanics is all about the sub atomic level i.e. Very very small stuff. Thing is the mathaticians can't get the two to merge and I am such a dullard I wouldn't even begin to attempt the maths. Having said that I am sure that we have a Quantum midfield
There's a supermassive black hole at the centre of every galaxy and many 1000's more standard black holes dotted around all galaxy's - the result of dying stars.
Gravity is the force that keeps the universe together. It seems that black holes are the core of gravity as they can bend space and time and absorb light. Once passed the event horizons even light cannot escape.
But where does it go?
Nobody knows but it's a similar conundrum with the number of goals we score. Our play is so negative it's like a black hole in that any quality going forward is sucked back over the half way line as it wants to go back to our goal and stay there safe and cushty.