Collapsed sections of lava tubes, called skylights, could provide access to these subterranean refuges. Does this hole on Mars lead to a larger underground cavern? This image was captured by the ...

As far as scientists can tell, Mars is no longer volcanically active. So there's no risk of these giant volcanoes erupting. But there is a possibility that residual underground lava tubes may ...

Exploration of Mars has revealed the presence of large outflow channels which have been interpreted as the products of catastrophic flood events during which a large quantity of water was released ...