Chinese astronauts, known as taikonauts, were sent into a large limestone cave system in a remote area of China.

On February 4, after five days, Sand Cave collapsed in two places, sealing off the only route volunteers had to reach Collins ...

Peeling back the layers of our Earth’s crust, scientists have unveiled an astonishing underground realm in the United States. This monumental subterranean labyrinth promises not only breathtaking ...

CHONGQING, Jan. 5 (Xinhua) -- China's first astronaut cave-training mission has been completed in its southwestern Chongqing Municipality, with 28 astronauts having taken part.

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 ...

Fresh orbital images and new geological analysis have revealed eight mysterious caves on Mars that appear unusually well suited to protect traces of life. Together, these caverns, portals and ...