Across
- 2. The galaxy containing the solar system
- 5. The planet that is famous for its rings
- 7. The biggest star in the universe
- 8. Know as the 'Red Planet'
- 9. No longer a 'officially considered a planet'
Down
- 1. The cosmic explosion that marked the origin of the universe
- 2. The closet planet to the Sun
- 3. Coldest planet in the solar system
- 4. Closest planet to Earth
- 6. The planet that has an atmosphere containing 21 percent oxygen.