Space Crossword

1234567891011121314151617
Across
  1. 2. Huge explosion
  2. 5. The closest planet
  3. 11. First stage in a star's formation
  4. 14. what planet was discovered in 1781
  5. 15. Object used for communication
  6. 16. Inner planets composition
  7. 17. Natural satellite
Down
  1. 1. Planet with a big red spot
  2. 3. All matter and energy that space includes
  3. 4. Rock that hits the surface of earth
  4. 6. Icy rocky object floating in space
  5. 7. Huge explosion that formed the universe
  6. 8. Metallic rocky object in space
  7. 9. Gas and dust that forms into a star
  8. 10. Our former 9th planet
  9. 12. Neptune's biggest moon
  10. 13. celestial object with rings