Out of this world

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Across
  1. 3. people that are in space
  2. 6. the first man on the moon
  3. 9. something that used to be a planet
  4. 10. it has planets, stars and moons
  5. 14. it's in the scienceworks
  6. 17. you see it in the sky at night
Down
  1. 1. it's the closest planet to the sun
  2. 2. He discovered the sun spots and solar flares
  3. 4. is the coldest planet in the solar system
  4. 5. it is one of the gas giants
  5. 7. there is lots of them
  6. 8. it takes 27 days to orbit the earth
  7. 11. it keeps us alive
  8. 12. you use it to look up in the stars at night
  9. 13. it's something we live on
  10. 15. the first dog on moon
  11. 16. one of jupiter's moon has water