Across
- 1. Known as the red planet.
- 2. The largest planet.
- 3. The hottest planet.
- 5. The force that keeps the planets in orbit.
- 6. The coldest planet.
- 8. Used to travel to the moon.
Down
- 1. The closest planet to the Sun.
- 4. The third planet from the Sun.
- 5. A vast collection of stars.
- 7. Earth's only natural satellite.