While an icy Earth is uncommon ... But the climate and weather variations on our planet — brought on by cold poles and a warm equator — drove us to become a highly adaptable species.

Cold, dark and windswept - despite its calm appearance ... Later observations revealed the planet to be a strange, icy world. Its atmosphere is the coldest of any planet in our solar system, and ...

Mars may once have held enough water to fill oceans and form coastlines. The planet’s red dust contains water and likely formed in cold conditions.

The polar vortex’s icy grip on much of America has Arctic Greenland seeming like a toasty vacation spot by comparison.