Physics 7.1 Planetary motion

1234567
Across
  1. 3. used a telescope to observe other planets
  2. 6. states the paths of planets are ellipses with the sun at one focus
  3. 7. model made by Copernicus showing the sun as the center
Down
  1. 1. realized the charts of time didn't predict astronomical events
  2. 2. states an imaginary line from the sun to a planet sweeps out equal areas in equal time
  3. 4. states (Ta/Tb)squared = (Ra/Rb)cubed
  4. 5. model made by Ptolemy using earth as the center of the center