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Across 1. was first to use a telescope to study the stars 5. a big invention for small things 7. that which moons of Jupiter were first discovered 9. someone who studies the stars 10. the father of chemistry 13. instrument that measures air pressure 15. the path of a planet around the sun 16. a way of looking at the world through logic and reason 19. discovered that planets orbits are elliptical 20. 3 dimensional representation of the earth

Down 2. what you do to test a theory 3. said the Earth revolved around the sun 4. literally translated from the Latin, means "earth" "write" 6. an advanced form of mathematics 7. a reason for phenomena based on facts 8. a satellite of a planet 11. to look at something thoughtfully 12. the mysterious force that will one day destroy our solar system 14. very, very different; also something surfers say 17. made 4 laws 18. known for his extensive and detailed notes