Astronomy #1

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Across
  1. 4. means to spin backwards
  2. 5. Discovered planets move in ellipses
  3. 7. Developed the Geocentric theory
  4. 9. going around an object
  5. 11. not too hot, not too cold, just right
  6. 13. the lighter shadow of an eclipse
  7. 15. the eclipse where the moon is blocked out
  8. 16. the planet of extremes
  9. 17. an eclipse where the sun is blocked out
Down
  1. 1. The study of space and everything in it
  2. 2. The trapping of heat in the atmosphere
  3. 3. Discovered that Venus went through phases
  4. 6. the spinning of Earth
  5. 8. Developed the Heliocentric theory
  6. 10. caused by Earth's tilt and revolution
  7. 12. the darkest shadow of an eclipse
  8. 14. Earth's twin