Astronomy words

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Across
  1. 1. dwarf star in the center of the solar system
  2. 4. semi-circular path around a star
  3. 5. meteor that landed on earth
  4. 10. non-circular rock circling a star
  5. 11. round object that circles a star
  6. 12. smallest planet
Down
  1. 1. huge ball of gas held together with gravity
  2. 2. randomly shaped rock moving through space
  3. 3. icy object moving through space with a tail
  4. 6. round object that circles a planet
  5. 7. heaps of stars that are circling a black hole
  6. 8. giant icy planet
  7. 9. planet famous for its rings