The universe crossword puzzle

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Across
  1. 2. a celestial object consisting of a nucleus of ice and dust and, when near the sun forms a tail
  2. 4. the action of rotating around an axis or center
  3. 5. a celestial body moving in an elliptical orbit around the sun
  4. 6. a system of millions or billions of stars,together with gas and dust,held together by gravitational attraction
  5. 9. the natural satellite of earth,visible by reflected light from the sun
  6. 11. the planets closest to the sun
Down
  1. 1. system the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteriods,meteriods, and comets
  2. 3. the planets farthest from the sun
  3. 7. an imaginary line about which a body rotates
  4. 8. all existing matter and space considered as a whole; the cosmos
  5. 10. an instant of revolving
  6. 12. a small rocky body orbiting the sun. Makes up the asteriod belt