Alexandra Porter P.7

3. one of numerous small solid heavenly bodies which may have existed at an early stage of the development of the solar system and from which the planets may have been formed.
6. a ring of icy bodies just outside of Neptune's orbit.
11. Space rocks and chunks of space metal that land on Earth
12. the four innermost planets in the solar system.
13. Small chunks of rock that travel through space
14. an interaction between a planet, such as Earth, and streams of debris from a comet.
15. a measure of how non-circular the orbit of a body is.
16. a place between the rocky planets and the gas planets
17. Hydrogen becomes a liquid at very low temperature and high pressure.

1. a large planet mostly composed of helium and/or hydrogen
2. Celestial bodies that are too tiny to be classified as planets but too huge to be classified as stars.
4. the orbit of each planet in the Solar System is approximately an ellipse with the Sun at one focus point
5. a small chunk of dust and ice that orbits, or travels around, the sun.
7. a line of cliffs formed by the faulting or fracturing of the earth's crust
8. the area around a star where it is not too hot and not too cold for liquid water to exist on the surface of surrounding planets
9. at the planet's opposition which is when it is exactly opposite the Sun.
10. the distance between the Earth and the Sun.
11. Small chunks of rock that travel through space