Hailey Simpson, Period:3

2. The path of a heavenly body moving around another in a closed orbit in accordance with Isaac Newton's gravitational law.
7. A place between the rocky planets and the gas planets.
9. A steep slope or cliff found at the margin of a flat or gently sloping area, usually against the dip of the rocks.
14. A large planet mostly composed of helium and or hydrogen.
15. A celestial object when near the sun, a “tail” of gas and dust particles pointing away from the sun.
16. A number of meteors are observed to radiate, or originate, from one point in the night sky.
18. The average distance from the Earth to the Sun.

1. A fundamental system in condensed matter sciences and the main constituent of gas giant planets.
3. A celestial body resembling a small planet.
4. The extent to which an orbit is elliptical or deviates from a perfect circle
5. A planet that is made up of silicate rocks or metals.
6. The orbital motion of a spatial body in a direction that is opposite of what is normal in a given system.
8. A meteor that survives its passage through the earth's atmosphere.
10. A doughnut-shaped region of icy objects beyond the orbit of Neptune.
11. Any of innumerable small bodies of accreted gas and dust thought to have orbited the Sun during the formation of the planets.
12. A small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
13. A small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.
17. The area around a star where it's not too hot or cold.