From lava tubes on Mars to ice pockets on Europa, subterranean environments may offer the best chance of finding life—and living safely—beyond our planet. “I was like, ‘OK, I'm pretty sure that ...

A striking image captured by NASA has renewed speculation about the possibility of life on Mars. The photo reveals a deep,circular hole on the Martian surface and scientists believe it could be a ...

Looking for an adventure that’s cool (literally) and completely out of the ordinary? The United States is home to some of the world’s most fascinating cave systems, each with its own story carved by ...