Mars skylights like this could be the mouths of caves formed by lava tubes. NASA wants to explore them. Credit: NASA / JPL-Caltech / Univ. of Arizona Ever since scientists have had an orbiter's view ...

When we think of nature in Spain, mountains, cliffs and beaches often come to mind – yet beneath these landscapes lies a ...

Discover the jaw-dropping historical icon that is the underground wonderland of Mammoth Cave National Park in Kentucky.

The surface of Mars is hostile and unforgiving. But put a few meters of regolith between you and the Martian sky, and the place becomes a little more habitable. Cave entrances from collapsed lava ...

Is there life in Martian caves? It's a good question, but it's not the right question—yet. An international collaboration of scientists led by NAU researcher Jut Wynne has dozens of questions we need ...

On Sunday’s episode of The Excerpt podcast: Hidden beneath Earth’s surface are caverns and pathways that hold the secrets of our planet’s very beginnings. Even after decades of exploration, there are ...

Cave explorers have traversed what’s now the deepest known cave in Australia. On Saturday a group of explorers discovered a 401-metre-deep cave, which they named Delta Variant, in Tasmania’s ...