Across
- 1. The center of our solar system.
- 5. The planet with beautiful rings around it.
- 6. Scientists study their surfaces, atmospheres, and movements.
Down
- 2. The huge planet far from the sun, discovered in 1845.
- 3. The red planet with largest mountain, Olympus Mons.
- 4. The second planet from the sun; it is very hot and called Earth’s twin.