The Planets Crossword

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Across
  1. 2. a dwarf planet
  2. 3. asteroids are mostly made of air and ?
  3. 5. ? second brightest object in the night sky(after the moon)
  4. 6. Saturn is surrounded by ?
  5. 8. Uranus can not be seen from the Earth without a ?
  6. 10. a person who goes into space by a rocket
  7. 11. surname of the first person on the moon
  8. 13. ? is the most distant planet from the sun
  9. 16. how many planets are there? (do not count Pluto)
  10. 17. mercury is the closest planet to the ?
  11. 19. our galaxy is called the ?
  12. 20. the sun is a very large ?
Down
  1. 1. a stellar explosion of stars
  2. 4. groups of stars that form patterns in the night sky
  3. 7. the only celestial body humans have set foot, other than Earth
  4. 9. the largest planet in the solar system
  5. 12. solid piece of debis that survives impact with the Earth
  6. 14. a planet where humans live
  7. 15. each star in the sky is an enormous glowing ball of ?
  8. 18. known as the red planet