Sun, Moon and Earth

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Across
  1. 5. Centre of universe
  2. 6. When the moon grows larger
  3. 7. Force that keeps you on the ground
  4. 10. Spinning motion around axis
  5. 11. 4 per year involving changing temperatures
  6. 12. Invisible line Earth rotates on
  7. 14. Celestial body orbiting around a planet or star
  8. 15. Contains trillions of stars
  9. 16. Has an atmosphere
  10. 17. Earth's natural satellite
Down
  1. 1. Path of one object around another
  2. 2. Where planets, moons and stars live together
  3. 3. Moon passing in front of Sun
  4. 4. When the moon grows smaller
  5. 5. Giant balls of hot gasses
  6. 8. Mass of gasses surrounding Earth
  7. 9. Group of stars forming a pattern
  8. 13. Object with a "tail"
  9. 17. Called the "Red Planet"