Spaced out!

12345678
Across
  1. 3. These objects are minor planets, small rocky bodies in the solar system
  2. 5. The phase that occurs just before a new moon
  3. 8. The sixth planet from the sun, this is recognisable by its characteristic ring
Down
  1. 1. The asteroid belt lies between these two planets
  2. 2. The shape of the orbit of a comet around the sun
  3. 4. The phase of the moon that occurs just before a full moon
  4. 6. This orbits the sun and is made of ice
  5. 7. The sun is one of these