A giant ice planet over four billion kilometers from the Sun, here it is so cold that clouds of methane ice form. CG illustration of Neptune’s atmosphere. Courtesy of BBC Studios/Pond5.
The Planets: Ice Worlds
In the far reaches of the solar system, Uranus and Neptune dazzle with unexpected rings, supersonic winds and dozens of moons. And NASA's New Horizons gets a stunning up-close view of Pluto before venturing deep into the Kuiper Belt.