Aiden's space crossword puzzle

12345678
Across
  1. 2. circle around the outer planets
  2. 5. has planets like ours
  3. 8. made of rock
Down
  1. 1. made of gas
  2. 3. hot balls of gas
  3. 4. orbit around most planets
  4. 5. our star
  5. 6. a complete orbit around the sun
  6. 7. our planet