Scientists have discovered caves on Mars that may have once harbored life, offering a potential new avenue for the search for extraterrestrial life. These caves, carved by water, are located in the Hebrus Valles region and could provide natural shelters for astronauts and serve as landing sites for future missions. The caves are distinct from the lava tubes and impact craters that have been previously discovered on Mars. The study, published in The Astrophysical Journal Letters, presents the first evidence of karstic caves on Mars, formed by water dissolving carbonate- and sulfate-rich rocks on the planet's crust. The researchers used data from the Thermal Emission Spectrometer (TES) and high-resolution imagery to create 3D structural models of the pits, which showed that their shapes are consistent with collapse caused by water rather than volcanic or tectonic activity. The caves are eight deep, circular depressions, not impact craters, which typically have raised rims and ejected debris around them. The search for life on Mars is challenging, but these caves could be high-priority targets for future human or robotic missions, providing well-defined targets for the search for life and potential landing sites for astronauts.
