Space Crossword

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Across
  1. 1. The imaginary line on which Earth and the moon rotate
  2. 4. A chunk of rock or metal going through Earth's atmosphere
  3. 5. A chunk of rock or metal floating through space
  4. 10. The point of the planets' orbit closest to the sun
  5. 11. This person believed that the universe was sun centered
  6. 12. The planet closest to the sun
  7. 13. The motion of an object around another object
  8. 14. The longest day of the year
  9. 16. An object that revolves around a planet
  10. 17. A big ball of fire
  11. 20. Grouping of stars used for navigation
  12. 22. Our planet
  13. 23. The Earth's natural satellite
Down
  1. 1. The point of the planets' orbit farthest from the sun
  2. 2. This person believed that the universe was Earth centered
  3. 3. The movement of Earth on its axis
  4. 5. A chunk of rock or metal that hit the ground
  5. 6. The idea that the solar system revolves around the sun
  6. 7. The shortest day of the year
  7. 8. This happens on September 21
  8. 9. The idea that the solar system revolves around the earth
  9. 15. The shape of Earth's orbit
  10. 18. The study of the planets
  11. 19. This happens on March 21
  12. 21. The study of objects and their supposed effect on Earth