crossword puzzle

1. 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.
3. at the planet's opposition which is when it is exactly opposite the Sun.
5. a measure of how non-circular the orbit of a body is.
6. Small chunks of rock that travel through space
8. a ring of icy bodies just outside of Neptune's orbit.
13. a small chunk of dust and ice that orbits, or travels around, the sun.
14. an interaction between a planet, such as Earth, and streams of debris from a comet.
15. the orbit of each planet in the Solar System is approximately an ellipse with the Sun at one focus point
16. a large planet mostly composed of helium and/or hydrogen
17. a place between the rocky planets and the gas planets

2. Hydrogen becomes a liquid at very low temperature and high pressure.
4. space rocks and chunks of space metal that land on Earth
7. the distance between the Earth and the Sun.
9. the celestial bodies that are too tiny to be classified as planets but too huge to be classified as stars.
10. 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
11. the four innermost planets in the solar system.
12. a line of cliffs formed by the faulting or fracturing of the earth's crust
14. Small chunks of rock that travel through space