- 2 Astronomy a distant planet of the solar system, seventh in order from the sun, discovered by William Herschel in 1781.
Uranus orbits between Jupiter and Neptune at an average distance of 1,785 million miles (2,872 million km) from the sun. It has an equatorial diameter of 31,763 miles (51,118 km) and is one of the gas giants. The planet is bluish-green in color, having an upper atmosphere consisting almost entirely of hydrogen and helium. There are at least seventeen satellites, the largest of which are Oberon and Titania, and a faint ring system
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