Getting humans into space is hard enough, but having them stay on another body for any length of time is even more challenging. When astronauts visited the moon in the Apollo missions, they lived in ...

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 discovered a mysterious hole on the surface of Mars, and they have no idea what lies inside it. This pit, ...

A pit, leading to a cave, in the Mare Tranquillitatis region of the moon. Credit: NASA / GSFC / Arizona State University Scientists have long suspected the moon may harbor dark labyrinths. They now ...