Across
- 2. small circles that planets move in
- 4. one of the people who developed the Geocentric theory
- 5. theory theory that the earth is at the center of the solar system
- 6. calculated that the shape of the orbits was an ellipse
- 8. tried to combine the geocentric and heliocentric theories
- 9. invented the telescope
- 11. described the law of gravity
- 12. described epicycles
Down
- 1. theory theory that the sun is at the center of the solar system
- 3. one of the people who developed the Geocentric theory
- 7. a planet's sphere
- 10. created the Heliocentric theory