Astronomy words

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Across
  1. 3. The only planet with Life on it
  2. 5. have no moons
  3. 9. The study of space
  4. 11. a dwarf planet
  5. 14. Sun centered Model
  6. 16. The start of humans
  7. 17. planets the planets closest the sun
  8. 18. The red planet
  9. 19. What do the planets orbit
  10. 20. bang The start of the universe
Down
  1. 1. Earth Centered model
  2. 2. objects that revolve around the sun
  3. 4. A guess not proven by science
  4. 6. The great red spot
  5. 7. Made the Heliocentric theory
  6. 8. Who made the geocentric model
  7. 10. The largest planet
  8. 12. revolves around planets
  9. 13. The first man on the moon
  10. 15. small balls of gas