How Black Holes Work  Black Hole Image Gallery Artist concept of
the near vicinity of the black hole at the core of galaxy NGC
4261. See more black hole images.  Photo courtesy NASA/Space
Telescope Science Institute (J. Gitlin, artist)  Introduction to
How Black Holes Work  You may have heard someone say, "My desk
has become a black hole!" You may have seen an astronomy program
on television or read a magazine article on black holes. These
exotic objects have captured our imagination ever since they
were predicted by Einstein's Theory of General Relativity in
1915.  What are black holes? Do they really exist? How can we
find them? In this article, we will examine black holes and
answer all of these questions!  How Black Holes Work  Artist
concept of a black hole: The arrows show the paths of objects in
and around the opening of the black hole.  Photo courtesy NASA
What is a Black Hole?  A black hole is what remains when a
massive star dies.  I­f you have read How Stars Work, then you
know that a star is a hu