[SMGFan]

Uranus is often referred to as an “ice giant” planet: Like the other gas giants, it has a hydrogen upper layer, which has helium mixed in. Below that is an icy “mantle, which surrounds a rock and ice core.

http://space-facts.com/uranus/

[seawolf101]

Uranus is often referred to as an “ice giant” planet: Like the other gas giants, it has a hydrogen upper layer, which has helium mixed in. Below that is an icy “mantle, which surrounds a rock and ice core.

But where does all that methane come from?