The following are approximate diameters of some of the most familiar astronomical objects of the Solar System:
| Outer World | Diameter (km) |
|---|---|
| Mercury | 5,000 |
| Mars | 7,000 |
| Venus | 12,000 |
| Earth (You are Here!) | 13,000 |
| Neptune | 48,000 |
| Saturn | 120,000 |
| Jupiter | 140,000 |
The Moon is 3,500 km in diameter. That’s bigger than the ninth planet of our Solar System – Pluto is only 2,400 km.
The Sun is 109 times the diameter of Earth.