Across
- 6. These are very small, but they put out more light and more radio waves than entire galaxies.
- 8. This planet is known best for its rings.
- 9. These usually appear when very large stars burn out.
- 12. Collections of several million stars.
- 13. This planet has a blue atmosphere because it contains a great deal of methane gas.
- 14. The planet closest to the sun.
- 15. A rocky or metallic objects that orbit the sun.
Down
- 1. This planet has two small rocky moons called Phobos and Deimos.
- 2. Balls of hot gas.
- 3. This planet is four times bigger than earth.
- 4. The largest planet in the solar system.
- 5. It has such strong gravity that nothing can break free from it.
- 7. This planet is almost the same size as earth.
- 10. Huge spheres of rock or gas.
- 11. it lies at the center of our solar system.