Across
- 2. These are the hottest color of stars.
- 6. The lifespan of a star depends on this.
- 8. This type of magnitude describes how bright a star appears to be from Earth.
- 10. The study of the solar system
- 12. These are the last four planets.
Down
- 1. Largest planet in the solar system.
- 3. A large cluster of stars, dust, planets, and other solar bodies.
- 4. This is the force that holds the planets in place.
- 5. The outer planets are made mostly of this.
- 6. A burning ball of gas, mostly helium and hydrogen.
- 7. Third planet from the sun.
- 9. These are the first four planets.
- 11. The cloud where it is believed comets come from.