Across
- 4. A living thing from outside Earth (fancy word for alien).
- 6. The path something follows as it goes around a planet or star.
- 10. The layer of gases surrounding a planet.
- 11. A ball of ice and dust that travels through space with a bright tail.
- 12. A huge group of stars, planets, and dust.
Down
- 1. A large round object that moves around a star.
- 2. system The sun and all the objects that move around it.
- 3. A discussion where people share different ideas.
- 5. Everything that exists in space.
- 7. Facts and information we use to learn something.
- 8. A long trip from one place to another.
- 9. The area beyond Earth with stars and planets.