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Across 3. Wrote 3 laws of planetary motion based on mechanical relationships and accurately predicted movements of planets in a sun-centered universe 7. Also known as black powder 8. Originally formulated the sun-centered theory 9. Father of modern medicine 10. Enlarged small long distance objects 11. Created the Scientific Method 12. Father of Pharmacology

Down 1. Set up obervatory to study heavenly bodies and accumulated data on planetary movements 2. Proof of Copernicus' sun-centered theory 4. Type of eyeglasses 5. Replaced hand written books with printed ink ones 6. Improved the constant movement of the hands of a clock