time travel 3rd-5th

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Across
  1. 2. - a task or goal with a purpose
  2. 4. - arranged by time
  3. 6. - what is yet to come
  4. 7. — a person who discovers new places
  5. 8. - a puzzling situation that seems impossible
  6. 11. - an object from the past
  7. 15. - very old; from a long time ago
  8. 16. - what is happening now
  9. 17. - a sci-fi tunnel through space/time
  10. 18. - time that already happened
  11. 19. - someone who creates new things
  12. 20. - an old story that may not be true
  13. 21. - a group with cities, laws, and culture
Down
  1. 1. - another world or universe
  2. 3. - a trip from one place (or time) to another
  3. 4. - 100 years
  4. 5. - a large period in history
  5. 9. - finding something for the first time
  6. 10. - a small, useful device
  7. 12. - something from or about the future
  8. 13. - a person who studies history
  9. 14. - tools and machines people use