Planets Crossword

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Across
  1. 4. A group of stars, dust and gas held together by gravity
  2. 8. We can use this to see the stars?
  3. 9. Our galaxy
  4. 11. We live on ______
  5. 12. The red planet
  6. 13. An alien's spaceship
  7. 15. A rock that orbits the Sun
  8. 16. The Sun gives ________
  9. 17. Halley's________
  10. 18. There are billions of these in the universe
Down
  1. 1. Who says "to infinity and beyond"?
  2. 2. Amount of time it takes the Earth to spin once on its axis
  3. 3. Furthest away from the Sun
  4. 5. a chocolate bar
  5. 6. The closest planet to the Sun
  6. 7. Can fly to the moon
  7. 9. A planet with rings
  8. 10. Who can walk on the moon?
  9. 12. It comes out at night
  10. 14. The moon is covered in these