Cosmic Scale
Neptune vs Mercury: size comparison
Neptune is about 10.1 times wider than Mercury: 49,240 km across against 4,879 km.
Compare them in 3D, at true scale
| Neptune | Mercury | |
|---|---|---|
| Diameter | 49,240 km | 4,879 km |
| Mass | 1.02 × 10²⁶ kg | 3.30 × 10²³ kg |
| Light crosses it in | 0.16 seconds | 0.02 seconds |
- Neptune has about 1,030 times the volume of Mercury.
- Neptune is about 310 times more massive than Mercury.
- Light takes 0.16 seconds to cross Neptune, and 0.02 seconds to cross Mercury.
Neptune: Its winds are the fastest in the Solar System, over 2,000 km/h.
Mercury: A year on Mercury is shorter than one of its days.