Astronomy

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Across
  1. 5. star wavelengths are longer
  2. 9. the mass per unit volume
  3. 10. the energy required to remove it from the atom
  4. 11. star wavelengths are shorter
  5. 12. about 90% of stars lie along a band called
  6. 13. measure of how bright a star appears
  7. 14. analysis of spectra
  8. 15. or the spectrums of stars, are absorption spectrums
Down
  1. 1. are produced when electrons jump from higher energy levels back down to lower energy levels
  2. 2. the way the star appears in the sky
  3. 3. used in measuring the distance to nearby stars
  4. 4. the distance to an imaginary star whose parallaxes is 1 sec of arc
  5. 6. motion through space with respect to the sun of many kilometers a second
  6. 7. speed toward or away from us along the line of sight
  7. 8. the apparent change in a star's position