Astronomy

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Across
  1. 6. electron orbits
  2. 7. produced when electrons jump from higher energy levels back down to lower energy levels
  3. 8. used for measuring distances in the sky
  4. 11. atom left with positive charge
  5. 12. atom with least possible energy
  6. 13. lines named after Joseph von Fraunhofer
  7. 15. produced when an atom of chemical element absorbs light and the electrons jump out to higher energy levels
  8. 16. spectrum of stars
Down
  1. 1. energy required to remove it from the atom
  2. 2. classify stars into nine principal types
  3. 3. position and motion of stars
  4. 4. distance to an imaginary star whose parallax is 1 second of arc
  5. 5. analysis of spectra
  6. 9. tells the chemical element that it absorbs
  7. 10. pellet of light
  8. 14. smallest part of a chemical element