UNIT 21 - Science, space travel, the universe

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Across
  1. 3. a goal or purpose
  2. 11. testing an idea to see what happens
  3. 13. an organized society with cities and government
  4. 14. something that is unknown or hard to understand
  5. 17. making or creating a plan or idea
  6. 18. a place where water is stored
  7. 19. without any limit
  8. 20. a vehicle that travels in space
  9. 22. a rock from space that enters the Earth's atmosphere
  10. 23. the force that pulls objects toward each other
  11. 24. to confuse or puzzle someone
  12. 27. disorder or randomness in a system
  13. 29. a small rocky object in space
  14. 30. the path of an object around a planet or star
  15. 31. judging how good or correct something is
  16. 33. a region in space with very strong gravity
  17. 35. to move very fast in science fiction
  18. 36. to settle in a new land and control it
Down
  1. 1. the process of getting larger
  2. 2. to fall down or fail
  3. 4. having the skills or knowledge for something
  4. 5. no longer existing
  5. 6. how heavy something is for its size
  6. 7. an idea that can be tested in science
  7. 8. relating to the sun
  8. 9. energy that travels through space or air
  9. 10. a theoretical passage connecting two points in space
  10. 12. looking carefully at something
  11. 15. when one object blocks another in the sky
  12. 16. improving something to make it more accurate
  13. 21. material used to make clothes or objects
  14. 25. an idea suggested for discussion
  15. 26. to make a planet suitable for humans
  16. 28. a theory or idea that is not based on real science
  17. 32. relating to the moon
  18. 34. a small settlement far from other places