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Across
  1. 2. Something that we don’t fully understand.
  2. 5. Machines or tools that help people do things.
  3. 7. Maybe; something that could be true but is not certain.
  4. 11. Someone or something that comes from another place.
  5. 12. A thing that can be seen or touched.
  6. 13. The sun and everything that moves around it, like planets and asteroids.
  7. 15. The part of the solar system closer to the sun, including planets like Mercury, Venus, Earth, and Mars.
  8. 17. The distance that light travels in one year.
  9. 18. An idea that explains something, based on facts and studies.
  10. 20. Unusual or unexpected.
  11. 21. A long trip from one place to another.
Down
  1. 1. A group of stars and planets that are connected by gravity.
  2. 3. The speed at which sound travels through air.
  3. 4. Coming from outside our solar system.
  4. 6. To find something that was not known before.
  5. 8. In a way that is unusual or unexpected.
  6. 9. A rock that moves through space.
  7. 10. The fastest speed something can reach.
  8. 14. A vehicle made for traveling in space.
  9. 16. A scientist who studies objects in space.
  10. 19. To travel to a new place to learn about it.