ASTRO 1

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Across
  1. 2. distance from one wave peak to another
  2. 3. force of gravity acting between earth and moon, keeping moon in near circular path
  3. 4. messier 45
  4. 7. start of solar eclipse
  5. 9. Tycho's new star?
  6. 13. star that emits beams of electromagnetic radiation
  7. 14. a small cool star
  8. 15. volanic moon of jupiter
  9. 16. traditional name of bright star in cassiopia (alpha cas)
  10. 18. ? russell diagram
  11. 19. increase of radiation wavelength
  12. 20. star system combining two stars
  13. 21. shooting star
Down
  1. 1. sub atomic particle
  2. 3. regular variable
  3. 5. measuring the stars
  4. 6. star exhausted its hydrogen and much bigger than our Sun
  5. 8. solid resembling a ring doughnut
  6. 10. either proton or neutron
  7. 11. small body found between mars and jupiter
  8. 12. measuring stellar distances
  9. 17. messier 13 cluster