Io is an incredibly active and extreme place, with glistening lava lakes and volcanic eruptions shooting sulfur and magma to huge heights.

Jupiter’s skies can glow with lights more intense than anything on Earth. Its polar auroras shine when charged particles ...

The Inuit on Little Diomede are watched over by Russian soldiers. But that’s not their biggest problem in these icy badlands ...

It was the first human spaceflight to circle the globe above the poles and the first Pacific splashdown for a space crew in 50 years.

Polar bears aren't white, strawberries aren't berries and the Earth isn't round—we'll have you rethinking everything you ...