Across
- 4. establishes a relationship between a planet's orbital period and its distance from the Sun
- 6. model that says Earth is at the center of the universe with celestial bodies orbiting around it
- 7. a rotating cloud of gas and dust
- 10. Geometric shape of planetary orbits, characterized by two foci and varying eccentricity
- 11. planets orbit the Sun in elliptical paths, with the Sun at one focus of the ellipse.
Down
- 1. placing the Sun at the center of the universe
- 2. Measure of how elliptical an orbit is, ranging from 0 (circular) to 1
- 3. model that says that as a molecular cloud collapses toward a single point, pre-existing motion within the cloud will cause the collapsing mass to begin rotating and then flatten with a central bulge
- 5. nebular debris clumped together
- 6. Jupiter, Saturn, Uranus, Neptune; made of Helium and Hydrogen
- 8. formed closer to the Sun from denser materials, Mercury, Venus, Earth, Mars
- 9. planets move faster when closer to the Sun and slower when farther away,