Topics of this game:
- the smallest and innermost planet in the Solar System.
- the second planet from the Sun
- the third planet from the Sun and the only astronomical object known to harbor life.
- is the fourth planet from the Sun and the second-smallest planet in the Solar System
- the fifth planet from the Sun and the largest in the Solar System
- the sixth planet from the Sun and the second-largest in the Solar System
- the seventh planet from the Sun
- the eighth and farthest known planet from the Sun in the Solar System
- the star at the center of the Solar System
