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Text File  |  1995-11-04  |  331b  |  10 lines
  1. variable star: A star whose size,
  2. brightness, and temperature fluctuate
  3. in a predictable pattern. Most variable
  4. stars fall into one of two broad
  5. categories: (1) pulsating stars, whose
  6. atmospheres actually expand and
  7. contract, and (2) cataclysmic
  8. variables, which undergo sudden,
  9. dramatic changes like novae and
  10. supernovae.