Across
- 3. A rock and iron object that orbits a star.
- 5. A nearly round body whose orbit crosses the orbits of other objects.
- 8. A group of billions of stars, with dust and gas orbiting the stars.
- 9. Everything that exists.
Down
- 1. A chunk of frozen gases, rock, ice, and dust.
- 2. A large ball of hot, glowing gases that produces its own heat.
- 4. A system that contains stars, planets, and other space objects.
- 6. A large, round body that revolves around a star.
- 7. The study of objects in space and their characteristics.