Black Holes
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Black Holes
Black Holes
Black holes are one of the more bizarre and intriguing predictions of 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 are kept from collapsing by
electromagnetic forces. The gas in an active star is held up by thermal pressure. However,
once a star uses up its thermonuclear fuel, it starts to collapse, and if there is enough mass
to overcome other, microscopic forces, it collapses into a black hole. According to
Einstein's theory, if we could pack enough matter into a small enough volume, the thing
created inside will get so deep that the matter inside can never escape. A circle of no
return forms. Any matter that passes the point of no return can no longer escape to the
outside world. It necessarily keeps collapsing, moving towards the center. It gets deeper
and deeper until finally a hole is literally torn in the fabric of spacetime:
the density of matter at the center becomes essentially infinite. Thus, what is meant by a
hole in the fabric of spacetime is: a tiny region of space where the known laws of physi...
The complete article is about 608 words and 2.43 pages long.
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