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The atmosphere of Uranus is composed of 83% helium, 15% methane and 2% methane plus trace amounts of other gases such as ethane. The average temperature of the surface of Uranus is 49Â° Kelvin or -224Â° Celsius.What makes the planet so cold is that it has a low internal temperature.ranus is 14.5 times bigger than Earth, making it the third largest planet in the Solar System after Jupiter and Saturn; Uranusâs core alone is as large as our planet.
Discovered first in 1781 by William Herschel and is the seventh planet in our solar system. Itâs a gas giant that has one of the coldest planetary atmospheres in our solar system with a minimum temp of 49 K (â224.2 Â°C). Uranus has a very featureless look, but in reality the cloud structure is more, for starters itâs layered.