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Across
  1. 2. Greek philosopher who believed in geocentrism
  2. 4. Polish mathematician and astronomer
  3. 8. Ancient Greek astronomer and mathematician
  4. 10. Egyptian mathematician and astronomer
Down
  1. 1. created by a lense maker to see into space
  2. 3. when the sun is at the center of the universe
  3. 5. the main reason Copernicus did not post his work
  4. 6. when the Earth is at the center of the universe
  5. 7. An Italian astronomer physicist and engineer
  6. 9. the phases of this planet were discovered by Galileo