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Across 2. literally translated from the Latin, means "earth" "write" 4. that which moons of Jupiter were first discovered 5. made 4 laws 7. said the Earth revolved around the sun 10. known for his extensive and detailed notes 12. the father of chemistry 14. instrument that measures air pressure 15. was first to use a telescope to study the stars 16. a big invention for small things 20. a reason for phenomena based on facts

Down 1. a satellite of a planet 3. someone who studies the stars 6. to look at something thoughtfully 8. what you do to test a theory 9. an advanced form of mathematics 11. discovered that planets orbits are elliptical 13. the path of a planet around the sun 15. the mysterious force that will one day destroy our solar system 17. very, very different; also something surfers say 18. a way of looking at the world through logic and reason 19. 3 dimensional representation of the earth