Black holes did exist in 1999, and long before that. While black holes cannot be observed directly, they have been hinted at having existed by Einstein. The first real recording of the side effects of a Black hole was in 1971.
Cygnus X-1; Sagittarius A* Actually, any observed black hole can be assumed to have been a star at some moment; although in the case of the supermassive black holes, it is not quite clear how they formed.
Well, there are two kinds of black holes. The normal black holes and the supermassive black holes. The supermassive black holes are a billion times bigger then our sun, while normal black holes are the same size as the Earth.
No. It certainly has black holes, but it has other things as well. No. It certainly has black holes, but it has other things as well. No. It certainly has black holes, but it has other things as well. No. It certainly has black holes, but it has other things as well.
it is theorized that it is possible for black holes to act as worm holes but most scientists believe their gravitational pull is simply too powerful for anything to survive being ripped to pieces before it goes anywhere.
Black holes are a mystery because nothing can escape a black hole. Not even light can escape its gravitational pull. Nobody knows what is inside a black hole because humans can not get that close. We will get crushed far before we get inside the black hole.