Volcanic caves are not just an Earth thing. Scientists have spotted signs of lava tubes on the Moon and Mars. Now, ...

A mysterious pit on the flank of an ancient volcano on Mars has generated excitement recently because of what it could reveal beneath the surface of the Red Planet. Here's what that means. First ...

Earthbound telescopes saw rills or gullies that later proved to be collapsed lava tubes. Then, in the Apollo era, close-up images showed large, very deep craters that later turned out to be empty lava ...

Scientists have confirmed a massive underground lava tunnel beneath Venus using radar data from NASA’s Magellan mission.

A mysterious pit on the flank of an ancient volcano on Mars has generated excitement recently because of what it could reveal beneath the surface of the Red Planet. Here's what that means. First ...

CAPE CANAVERAL, Fla. (AP) - Scientists have confirmed a cave on the moon, not far from where Neil Armstrong and Buzz Aldrin landed 55 years ago, and suspect there are hundreds more that could house ...

There is probably a network of caves hidden just below the surface of the moon, and researchers may have finally found an access point. These caves have long been predicted, but until now it has been ...

This is a view of the Mare Tranquillitatis pit crater, showing “boulders on an otherwise smooth floor.” It could be a cave entrance. NASA/Goddard/Arizona State University image The moon just got a ...