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Text File  |  1995-11-04  |  312b  |  9 lines
  1. accretion disk: Gas and dust that
  2. have accumulated into a disk around
  3. an astronomical object, such as a star
  4. or black hole. The inner part of the
  5. disk is pulled into the central object
  6. by gravity, while the outer parts
  7. circling the object are heated by
  8. gravitational energy, which causes
  9. them to radiate.