Cosmic Scale
Neptune vs Earth: size comparison
Neptune is about 3.86 times wider than Earth: 49,240 km across against 12,740 km.
Compare them in 3D, at true scale
| Neptune | Earth | |
|---|---|---|
| Diameter | 49,240 km | 12,740 km |
| Mass | 1.02 × 10²⁶ kg | 5.97 × 10²⁴ kg |
| Light crosses it in | 0.16 seconds | 0.04 seconds |
- Neptune has about 57.7 times the volume of Earth.
- Neptune is about 17.1 times more massive than Earth.
- Light takes 0.16 seconds to cross Neptune, and 0.04 seconds to cross Earth.
Neptune: Its winds are the fastest in the Solar System, over 2,000 km/h.
Earth: The only known world with life — and liquid oceans on its surface.