Einstein's theory of gravity. Surprisingly, there is now a great deal of observational

evidence that black holes do exist, both in binary star systems and at the center of most

galaxies, including our own. Although we are gaining more knowledge of black holes,

they still remain one of the strangest things anyone has ever heard of, and we may never

know what exactly one of these things are and can do. It is impossible to manufacture

black holes in a laboratory. The density of matter required is too great. In order to make a

black hole the size of a baseball, you would have to pack all the matter in and on the

Earth into a volume the size of a fist. Nature can make black holes, however. Matter

naturally collapses unless there is some other force to hold it up. The objects in a room

your falling to the center as much as you can’t help yourself falling into the future. Black

To a distant observer, events near the horizon appear to slow down. If you drop a clock

Some topics in this essay:
Stephen Hawking, Holes Black, According Einstein's, black holes, black hole, event horizon, fabric spacetime, density matter, pack matter, region space, einstein's theory, distant observer,