The Solar System

3. a body that could or did come together with many others under gravitation to form a planet
6. Doughnut-shaped region of icy objects beyond the orbit of Neptune
11. space rocks that fall to Earth's surface
12. Earth-like planets made up of rocks or metal with a hard surface
13. a small body moving in the Solar System
14. a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky
15. the deviation of a planet's orbit from circularity
16. a zone of energetic charged particles
17. a fundamental system in condensed matter science and the main constituent of gas giant planets

1. a large planet mostly composed of helium and/or hydrogen
2. about the size of Earth's moon
4. a closed curve, the intersection of a right circular cone and a plane that is not parallel to the base, the axis, or an element of the cone
5. an icy, small Solar System body that warms and begins to release gasses when passing the Sun
7. a steep slope or cliff found at the margin of a flat or gently sloping area, usually against the dip of the rocks
8. any of the five regions of the Earth that are loosely divided according to prevailing climate and latitude
9. actual or apparent motion of a body in a direction opposite to that of the direct motions of
10. a unit of measurement equal to 149.6 million kilometers
11. a small body of matter from outer space