The outer planets of the Solar System are:
- Jupiter (radius: 69,911 km)
- Saturn (radius: 58,232 km)
- Uranus (25,362 km)
- Neptune (24,622 km)
By looking at the radius of each planet, we can arrange them in order from the smallest to the largest, and we get:
1) Neptune
2) Uranus
3) Saturn
4) Jupiter