Across
- 6. A person who is trained to travel into space.
- 8. A bowl-shaped hole on a moon or planet made by a space rock.
- 9. The invisible force that pulls objects toward each other.
- 10. The third planet from the Sun and the one we live on.
- 12. Known as the Red Planet.
- 15. Once the ninth planet, it is now called a dwarf planet.
- 16. A tool used to see far away objects in the sky.
- 18. The cold, blue-green planet that spins on its side.
- 19. The big star at the center of our solar system.
Down
- 1. The windy, blue planet farthest from the Sun.
- 2. A giant ball of hot, glowing gas in space.
- 3. A vehicle used to fly into space.
- 4. The largest planet in our solar system.
- 5. The path a planet takes around the Sun.
- 7. The planet closest to the Sun.
- 11. A huge group of stars, gas, and dust held together.
- 12. The natural object that circles the Earth at night.
- 13. The planet famous for its bright, beautiful rings.
- 14. The hottest planet in our solar system.
- 17. A "dirty snowball" made of ice and dust with a long tail.