Space exploration

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Across
  1. 2. large areas of flat land
  2. 5. dry dirt or pieces of soil or sand
  3. 8. low land between hills or mountains
  4. 10. notice something that is not clear or hidden
  5. 12. something that's necessary
  6. 13. machine sent into space to travel around the earth and collect data or communicate.
  7. 14. cause to happen or exist.
  8. 16. the layer of gasses around a planet
  9. 18. units to measure tilt
  10. 19. more important than everything else
Down
  1. 1. very large
  2. 3. progress in science or technology
  3. 4. asked yourself something
  4. 6. one part of a thing, situation, or problem
  5. 7. tools designed to do a job on their own
  6. 9. to provide
  7. 11. large areas of countryside
  8. 15. a person who studies the stars and planets
  9. 17. evidence