Where would I most like to visit? That would probably be Venus. Uranus has methane in its atmosphere too, but not as much as Neptune, so Neptune can stay a little warmer than Uranus can. But the second is the methane in Neptune’s atmosphere, on Earth methane is known as a greenhouse gas, it is good at trapping heat like a nice jumper keeps you warm. There are two main reasons scientists think this is the case First, at these distances from the Sun there isn’t much heat to warm either of the planets, some heat comes from the planet's core, a bit like how the Earth’s core is hotter than its surface. The lowest temperature recorded there was minus 224 degrees Celsius. The coldest planet in our solar system on record goes to Uranus which is closer to the Sun and ‘only’ about 20 times further away from the Sun than the Earth is. The gases that remain in the atmosphere are mainly hydrogen and helium with a little bit of methane, which gives Neptune its vivid blue colour as seen in the Voyager 2 probe images (the only spacecraft ever to have flown close to Neptune as it is more than 30 times further from the Sun than the Earth is). Neptune’s gas clouds have an average temperature of 214 degrees below zero ( -214 ✬ ) which is easily cold enough to turn the two major gas elements in the Earth’s atmosphere oxygen and nitrogen into a liquid and a solid, imagine oxygen rain and nitrogen snow on Earth. This picture of Neptune was produced by the Voyager 2 probe in 1989 as it sped away from the planet and into the outer solar system.
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