The Solar System

4. To move in a circle around an axis.
6. A chunk of frozen gases, rock, ice and dust orbiting the Sun.
8. A star and all the planets and other objects that revolve around it. (hyphenated)
10. A large, round body that revolves around a star.
13. A single journey along an orbital path.
14. Everything that exists, including galaxies and everything in them.
15. A chunk of rock or iron less than 1,000 km in diameter that orbits the sun.
16. The force that pulls all objects towards each other.
17. An imaginary line around which a body rotates.

1. The study of objects in space and their properties.
2. A chunk of rock from outer space that enters the Earth's atmosphere.
3. A huge ball of very hot, glowing gases in space that produces its own light and heat.
5. A layer of gases surrounding a planet, star, or moon.
6. A hole in the ground caused by the impact of an object from space.
7. Patterns of stars in the night sky.
9. A large body that orbits a planet.
11. The path of an object around another object, for example the path of the Earth around the Sun.
12. A meteoroid that does not burn up in the Earth's atmosphere and lands on the ground.
16. A group of billions of stars, objects that orbit those stars, gas and dust.