Across
- 3. had the island observatory
- 7. Sun at its center
- 9. law states for every action there is an equal and opposite reaction
- 10. law states that P2=A3
- 13. Austrian mathematician
- 14. supported heliocentric model
- 16. law states F=ma
- 17. proposed the heliocentric model
Down
- 1. backwards motion
- 2. accounted for unexplained planetary motion
- 4. favored the geocentric model
- 5. Earth at its center
- 6. law states that a planet moves faster closer to the Sun
- 8. law states object at rest stays at rest until acted upon by another force
- 11. any object in space
- 12. created law of universal gravitation
- 15. law states that orbits are ellipses