The Solar System and some other stuff.

3. Dark colored bands of gas on the gas giants.
4. When hydrogen is too hot to stay a liquid but under too much pressure to float freely as a gas.
6. The first planet from the sun.
8. A planet made mostly of gas and is very large in size.
10. Happens when the Earth passes through a comet's tail.
12. A region of the solar system beyond the orbit of of the last planet in the solar system.
14. The rock left behind after it crashes into earth.
15. The second planet from the sun.
19. The astronomical unit is a unit of length, roughly the distance from Earth to the Sun and approximately equal to 150 million kilometres.
23. Large objects made of dust and ice that orbit the Sun.
24. A planet that is made mostly of heavy elements.
25. A very steep bank or slope.
26. A navy blue colored planet, the 8th planet.

1. The largest planet in our solar system.
2. A streak of light made when space debris enters the atmosphere.
5. A world that fails to meet standards of a normal planet.
7. The apparent backwards movement of an object.
9. A cyan colored planet, the 7th planet.
11. The measure of how non-circular the orbit of a body is.
13. A closed-plane curve that results from the intersection of a plane cutting through a cone.
16. The third planet from the sun.
17. A minute planet; a body that could or did come together with many others under gravitation to form a planet.
18. Space debris that enters the atmosphere.
20. The gas giant with the famous rings, sixth planet from the sun.
21. Forth planet from the sun.
22. Light colored bands of gas on the gas giants.