Preview – The Planets: Into the Darkness: Ice Worlds

The Planets Neptune
Picture Shows: Triton is one of Neptune's 14 moons. From afar it looks like an icy object, but up close we've found this large moon to be active. Nitrogen geysers erupt from its icy surface 8km and rise as high as 8km above into the thin Nitrogen atmosphere. Satellite image and CG Illustration. Image Credit: BBC Studios/NASA/JPL-Caltech/Lunar & Planetary Institute.

The concluding part of Prof. Brian Cox’s brilliant series takes us to the outermost planets in the solar system.

We examine worlds that we have only ever visited once. There is Uranus, the coldest planet in the Solar System and which appears to be almost featureless. Neptune meanwhile is a planet that is home to moons that originally resided in the furthest edges of the solar system.

Lastly, there is the world we once thought was a planet, but isn’t – Pluto. It even turns out “dwarf planet” is active, with ice valances, geysers, and that heart-shaped plateau – which is strangely absent of craters.

The Planets is on BBC Two at 21.00.