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Text File  |  1995-11-04  |  365b  |  13 lines
  1. absorption line: A dark line in a
  2. continuous spectrum corresponding
  3. to absorption of photons by atoms or
  4. molecules. The wavelength, width,
  5. and other features of an absorption
  6. line are characteristic of a particular
  7. atom or molecule under particular
  8. physical conditions. Thus
  9. astronomers can study the physical
  10. conditions on distant celestial objects.
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