Science Puzzel

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Across
  1. 4. the Earth revolves on its ____ once every 24 hours
  2. 5. the collection of eight planets
  3. 8. The earth ________ every 24 hours
  4. 9. a small body of matter from outer space
  5. 10. lies outside the asteroid
Down
  1. 1. We live on a ______
  2. 2. The Planets _____ around the sun
  3. 3. A small hard rock
  4. 6. rocky object in the solar system
  5. 7. when near the sun a tail of gas