Crossword puzzle- Solar system

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Across
  1. 3. a large star in the centre of the solar system
  2. 5. composed of mostly gas
  3. 7. an icy body that releases gas or dust
  4. 9. a circular movement of an object
  5. 10. the first planet to be named after a dog
  6. 11. after the asteroid belt
  7. 13. before the asteroid belt
  8. 15. the only planet with visible rings
  9. 17. closest planet to the sun
Down
  1. 1. an imaginary straight line passing through all planets
  2. 2. hottest planet in the solar sytem
  3. 4. a layer of gases surrounding a planet
  4. 6. small, airless rocky worlds
  5. 8. a regular repeating path
  6. 12. it orbits the sun on it's side
  7. 14. only planet with life on it
  8. 16. last planet in the solar system