5/6 ch 4

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Across
  1. 4. brightness of a star
  2. 5. sphere of light
  3. 9. the lion
  4. 10. the dragon
  5. 12. _____ minor
  6. 13. spikes of hydrogen gas
  7. 15. the bull
  8. 18. a symmetrical oval
  9. 19. star system containing stars
  10. 20. force of attraction between two objects
Down
  1. 1. pictures in the stars
  2. 2. blackness is the absence of _______
  3. 3. people who study space
  4. 6. flying horse
  5. 7. an area containing no air or matter
  6. 8. revolve around
  7. 11. the study of heavenly bodies
  8. 13. bright stars surrounding the lions head
  9. 14. a star explosion
  10. 16. large clouds of gas and dust floating in space
  11. 17. a double star