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The only spacecraft to visit Uranus, Voyager 2, saw few features in the planet's atmosphere when it flew by in 1986. It did discover 10 moons and two rings in addition to studying moons and rings previously seen from Earth.
Moons of Uranus have been named for characters in the works of William Shakespeare and Alexander Pope.
Mean Distance from Sun | 2,870,972,200 km (1.78 x 109 miles) or 19.19 astronomical units |
Diameter | 51,118 km (31,763.3 miles) |
Volume (Earth = 1) | 52 |
Mass | 8.68 x 1025 kg (3.06 x 1027 ounces) or 14.48 (Earth = 1) |
Density | 1.30 gm/cm3 |
Surface gravity | 1.15 (Earth = 1) |
Rotation period (length of day in Earth hours) | 0.72 or 17.9 Earth hours (spins backwards compared to most other planets) |
Revolution period (length of year in Earth years) | 83.75 |
Mean surface temperature | -197.15 C (-322.87° F) |
Natural satellites | Five of largest are Miranda, Titania, Oberon, Umbriel, Ariel. Sixteen others had been discovered before 2001. |
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