History of Astronomy

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