Rotations, orbits, seasons

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Across
  1. 3. A space rock that lands on Earth.
  2. 5. A round 3 dimensional object.
  3. 8. When the sun is directly over the equator.
  4. 10. The farthest north or south the sun reaches.
  5. 13. An imaginary through the center of the Earth.
  6. 14. The spinning of the Earth on its axis.
  7. 15. One Earth rotation around its axis.
Down
  1. 1. Everything that exists.
  2. 2. One orbit around the sun.
  3. 4. The the shape of the Earths path around the sun.
  4. 6. A large cloud of duct that forms stars.
  5. 7. An imaginary line that runs around the Earth.
  6. 9. A force that exists between two objects.
  7. 11. The outermost layer of the sun.
  8. 12. One Earth revolution around the sun.