Time travel

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Across
  1. 2. – What word means going to another place, by car, plane, or in this case, through time?
  2. 3. – What word means the result of an action or decision, often negative?
  3. 7. – What are scientists called who study stars, planets, and space?
  4. 10. – What word means ideas that explain how something works?
  5. 13. – What do we see from the sun that travels very fast, and according to scientists, cannot be surpassed?
  6. 14. – What type of story is not real but is made up by the writer?
  7. 17. – What word means that something might happen or is not impossible?
  8. 19. – What word means "not sure" or "not definite"?
  9. 20. – What subject helps us learn about the world and the universe?
Down
  1. 1. – What word describes improvements or progress in technology or science?
  2. 4. – What word describes a situation where something seems impossible or self-contradictory?
  3. 5. – What word means "very interesting" or "amazing"?
  4. 6. – What science studies the universe, its origin, and how it works?
  5. 8. – What is the word for your father's or mother's father?
  6. 9. – What science studies energy, forces, and how things move?
  7. 11. – What word describes the order of events in time?
  8. 12. – What is the word for someone who sees something happen?
  9. 15. – What is the huge area outside the Earth where the stars and planets are?
  10. 16. – What word describes minutes, hours, and days that we use to measure events?
  11. 18. – What word describes how fast something is moving?