Space and astronomers

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Across
  1. 3. had Kepler as an assistant
  2. 5. Greek who said universe in 2 parts imperfect earth, perfect heavens
  3. 6. circular motion of planets
  4. 8. 3rd rock from the sun
  5. 10. astrological circle in Wyoming
  6. 15. number of full planets in our solar system
  7. 17. large stones in Wales
  8. 19. earth's star
  9. 20. earth at the center of the universe
Down
  1. 1. closest star to our sun
  2. 2. created scientific method
  3. 4. name of our galaxy
  4. 7. created epicycles
  5. 9. distance from the earth to the sun
  6. 11. sun at the center of the solar system
  7. 12. pioneered the laws of motion
  8. 13. calculated earth's radius
  9. 14. 1st to say heliocentric universe
  10. 16. said path of planets was an elipse
  11. 18. group of billions of stars, planets, and dust