space and physics Crossword puzzle

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Across
  1. 3. NASA made this in 1977 to see the universe better
  2. 6. a lot of country's went into making this
  3. 7. how big is this
  4. 8. this is what fuels the stars
  5. 11. we live on this place
  6. 13. stars are born here
  7. 14. a big star
  8. 16. once I'm going I don't want to stop because of this
  9. 17. they pull every thing into it
  10. 18. it just likes to pull you in
  11. 21. you need to travel vary fast for one whole year for this
Down
  1. 1. an hour and a half
  2. 2. lots of stars make this in the night sky
  3. 4. the outer most ring of rocks in our solar system
  4. 5. OH NO ITS GOING TO CRASH INTO US
  5. 8. we sent this into outer space to see it better
  6. 9. we send thes up into space for Internet or too see the galaxy better
  7. 10. this is the galaxy we live in
  8. 12. the closet star system to us
  9. 15. the moon likes to go in a circle around us but what is this called
  10. 18. a big swerle with lots of stars in them
  11. 19. we live on one of these
  12. 20. we have one of those in our solar system