Across
- 1. A very long trip or adventure
- 8. The vast area beyond Earth's atmosphere
- 9. A person who travels to space
- 10. What makes balloons float up
- 11. To move from one place to another
- 12. The air around a planet
- 14. A large, round object that orbits a star
Down
- 2. Everything that exists, everywhere
- 3. The Sun and all the planets orbiting it
- 4. A trip from which you don't come back
- 5. A vehicle designed for travel in space
- 6. Our home planet
- 7. A large collection of stars, dust, and gas
- 13. The path an object takes around a star or planet