cuh

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Across
  1. 3. the study of stars
  2. 6. the idea that the sun is the center of the universe
  3. 8. testing a theory
  4. 9. allows you to see far away things
  5. 10. improved the telescope
Down
  1. 1. made the laws of gravity
  2. 2. using numbers and equations
  3. 4. to watch something to gain knowledge
  4. 5. The idea that Earth is the center of the universe
  5. 7. made the heliocentric idea