Across
- 4. altered the first geo. model by moving the Earth to the side
- 6. supported Copernicus's model, found features on Moon
- 11. published first model of helioctentric solar system
- 12. first geocentric model had a tough time explaining ______ motion
- 13. P^2=a^3, Kepler's ____ ____
- 16. smaller orbits within larger ones
- 17. first model of the solar system
Down
- 1. proposed geocentric universe
- 2. Sun at the center
- 3. Developed 3 laws of orbital motion
- 5. Larger orbits of planets, that contain epicycles
- 7. Proved orbits' speeds were not uniform, Kepler's ____ ____
- 8. Galileo found the moons of ________
- 9. all orbits are ellipses, Kepler's _____ ___
- 10. first proposed heliocentrism
- 14. Observations were given to Kepler
- 15. published the laws of universal gravity