Across
- 4. The planet known as the 'Red Planet.'
- 5. The planet closest to the Sun.
- 7. The largest planet in our solar system.
Down
- 1. The force that keeps planets in orbit.
- 2. The planet with the most extensive ring system.
- 3. The star at the center of our solar system.
- 6. The only planet known to support life.
