Across
- 3. Is the smallest planet in our solar system.
- 4. Has an active surface, including volcanoes.
- 7. It’s the only planet in our solar system we know of that supports life.
- 8. Is the biggest planet in our solar system.
Down
- 1. Its atmosphere is made of hydrogen, helium, and methane.
- 2. It's called the Red Planet.
- 5. Is an ice giant.
- 6. Has a lovely set of seven main rings with spaces between them.