Which planet has the coldest atmosphere in the solar system?

  • Uranus correct

    Uranus's atmosphere, although similar to Jupiter's and Saturn's in its primary composition of hydrogen and helium, contains more "ices", such as water, ammonia, and methane, along with traces of other hydrocarbons. It is the coldest planetary atmosphere in the Solar System, with a minimum temperature of -371.5° F, and has a complex, layered cloud structure, with water thought to make up the lowest clouds, and methane the uppermost layer of clouds.

  • Mars
  • Saturn
  • Mercury
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