The Enlightenment!!

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Across
  1. 2. He built the telescope
  2. 5. A person who rules with absolute power
  3. 7. The earth is the center of the solar system
  4. 9. Discovered that the planets orbit the sun
Down
  1. 1. The sun is the center of the solar system
  2. 3. To know something one did not know before
  3. 4. He said ¨I think, therefore I am¨
  4. 6. He made the law of gravity
  5. 8. Wrote the ¨Leviathon¨