Uranus and Neptune
Uranus (planet) and Neptune (planet) side by side – to scale and in numbers.
| Uranus | Neptune | Uranus ÷ Neptune | |
|---|---|---|---|
| Diameter | 51,118 km | 49,528 km | 1.03 × |
| Mass | 8.68 × 10²⁵ kg | 1.02 × 10²⁶ kg | 0.85 × |
| Surface gravity | 8.70 m/s² | 11.00 m/s² | 0.79 × |
| Density | 1,270 kg/m³ | 1,638 kg/m³ | 0.78 × |
| Mean temperature | -195 °C | -200 °C | |
| Mean distance from the Sun | 2.87 billion km | 4.52 billion km | 0.63 × |
| Length of day | 17.2 h | 16.1 h | 1.07 × |
| Year (orbit around the Sun) | 83.75 years | 163.7 years | 0.51 × |
| Known moons | 28 | 16 | 1.75 × |
Data: NASA Planetary Fact Sheet, JPL SSD (planetary moons), JPL SBDB (dwarf planets) – public domain. Moon gravity is calculated from the JPL mass (GM) and radius; a moon’s “year” is its planet’s orbit around the Sun. A dash – no value in these sources.
⇄ Swap sides More about Uranus More about Neptune