An ancient Martian system of canyons and valleys could be home to archaic life forms, a ground-breaking scientific paper has found. Scientists investigating the Red Planet’s mind-boggling cave system ...

Stretching more than 200,000 square kilometers (77,000 square miles) across southern Australia, the vast, flat plains of the ...

Stretching over 200,000 square kilometres across southern Australia, the vast, flat plains of the Nullarbor mark one of the world’s largest regions of limestone. It formed when an ancient shallow sea ...

Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode ...

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 ...

Across continents and cultures, remote caves, mountains, and subterranean labyrinths have long been regarded as secret refuges—hidden homes of gods, giants, and beings not entirely human.

Could ancient humans really have built the pyramids without extraterrestrial help? Or do such questions reveal more about modern anxieties than the past itself? The idea that aliens assisted the ...

An international team of cave explorers has shown that cave walls and the prehistoric rock art that adorns them can preserve human DNA for thousands of years. Using sterilized scalpels and two layers ...