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Text File  |  1995-11-04  |  409b  |  12 lines
  1. black hole: A compact object with
  2. such strong energy that light cannot
  3. escape from its surface. Astronomers
  4. believe that black holes are created
  5. when massive stars explode as
  6. supernovae. Supermassive black
  7. holes containing the mass of a billion
  8. Suns form the centers of some
  9. galaxies; although massive, black
  10. holes are tiny, with a theoretical
  11. volume of zero and a theoretical
  12. density of infinity.