Io, moon of Jespiter Jupiter, is famously volcanically active. It has more than 400 active volcanoes, over an area the size of Asia. Some of the volcanic mountains are taller than Mount Everest.

From the first woman to circumnavigate the globe by boat to the first to scale Everest, we’ve rounded up the most fabulous ...

A sudden, dramatic shift in temperatures high in the atmosphere will dance with the La Niña weather pattern. There won't be a clear winner.

An estimated 72% of Arctic Coastal Plain shorebirds – over 4.5 million birds – nest in the reserve. This includes the yellow-billed loon, the largest loon species in the world, with most of its U.S.