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Text File  |  1995-11-04  |  565b  |  16 lines
  1. spectrum: In astronomy, spectrum
  2. refers most often to: (1) the gradation
  3. of electromagnetic radiation from the
  4. longest wavelengths (lowest
  5. frequencies) to the shortest
  6. wavelengths (highest frequencies):
  7. radio, microwaves, infrared, visible,
  8. ultraviolet, x-rays, and gamma rays;
  9. or (2) the graph of the intensity of an
  10. objectΓÇÖs electromagnetic emission
  11. (usually on the y-axis) versus
  12. wavelength or frequency (usually on
  13. the x-axis), showing at which
  14. wavelengths the object radiates or
  15. absorbs most of its light.
  16. Spectroscopic analysis is the study