Neptune and Uranus
Neptune (planet) and Uranus (planet) side by side – to scale and in numbers.
| Neptune | Uranus | Neptune ÷ Uranus | |
|---|---|---|---|
| Diameter | 49,528 km | 51,118 km | 0.97 × |
| Mass | 1.02 × 10²⁶ kg | 8.68 × 10²⁵ kg | 1.18 × |
| Surface gravity | 11.00 m/s² | 8.70 m/s² | 1.26 × |
| Density | 1,638 kg/m³ | 1,270 kg/m³ | 1.29 × |
| Mean temperature | -200 °C | -195 °C | |
| Mean distance from the Sun | 4.52 billion km | 2.87 billion km | 1.57 × |
| Length of day | 16.1 h | 17.2 h | 0.94 × |
| Year (orbit around the Sun) | 163.7 years | 83.75 years | 1.95 × |
| Known moons | 16 | 28 | 0.57 × |
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.
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