Across
- 1. Worn by astronauts to survive in space.
- 3. A person who explores space.
- 7. The largest planet in our solar system.
- 9. A creature from another planet.
- 10. Everything that exists, including all galaxies and space.
- 12. A huge collection of stars, gas, and dust, like the Milky Way.
- 14. A vehicle that travels beyond Earth.
- 17. A space rock with a bright, glowing tail.
- 18. The layer of gases surrounding a planet.
Down
- 2. The star at the center of our solar system.
- 4. Some aliens have these wiggly arms.
- 5. The vast, empty expanse beyond Earth.
- 6. A large body orbiting a star, like Earth or Mars.
- 8. Saturn has beautiful ones made of ice and rock.
- 11. A giant ball of burning gas, like the Sun.
- 13. A rock floating in space, smaller than a planet.
- 15. The planet we live on.
- 16. Earth's natural satellite.