planets

2. a natural force that pulls two things together
4. known for its rings
6. the deviation of a planet's orbit from circularity — the higher the eccentricity, the greater the elliptical orbit. An ellipse has two foci, which are the points inside the ellipse where the sum of the distances from both foci to a point on the ellipse is constant.
8. tilted on its side
9. a unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun
10. a plane curve surrounding two focal points

1. only planet where life can survive
3. a minute planet; a body that could or did come together with many others under gravitation to form a planet.
5. actual or apparent motion of a body in a direction opposite to that of the (direct) motions of most members of the solar system or of other astronomical systems with a preferred direction of motion.
7. largest planet