SPACE

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Across
  1. 5. the fourth state of matter
  2. 8. what Saturn's rings are made of
  3. 11. unidentified flying object
  4. 12. what keeps astronauts alive inside a spaceship or spacestation
  5. 14. a piece of rock that has landed on the earth
  6. 17. he's the cutest thing in space
  7. 19. extraterrestrial life
  8. 20. the force of two objects pulling on each other
  9. 21. the estimated length of space
Down
  1. 1. a theoretical substance that is said to be everywhere
  2. 2. created when a star dies and becomes infinitely dense
  3. 3. an asteroid belt beyond Neptune
  4. 4. the distance light travels in a year
  5. 5. this object is not a planet but many people believe it should be
  6. 6. particles that make up everything
  7. 7. what it's called when a star explodes
  8. 9. first man on the moon
  9. 10. the first moon program
  10. 13. the coolest space movie around! may the force be with you
  11. 15. where we live (you should know)
  12. 16. a planet outside of our solar system
  13. 18. the second moon program
  14. 20. Milky Way, Pegasus, and Black Eye to name a few