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Text File  |  1995-11-04  |  326b  |  9 lines
  1. luminosity: The total power output
  2. of a radiation source such as a star or
  3. galaxy. Stars can be classified by their
  4. relative luminosities: supergiants,
  5. bright giants, giants, subgiants,
  6. dwarfs, and subdwarfs. Although our
  7. Sun is bright enough to blind a
  8. person from 149 million kilometers,
  9. it is classified as a dwarf.