A NASA spacecraft found seven possible cave entrances on Mars, triggering interest in hunting for other caverns that might be hiding life on the Red Planet, the US space agency said Friday.
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While the possible caves discovered are too high in altitude to host life, scientists say caverns elsewhere on the Red Planet could be underground habitats or even one day become shelters for astronauts.

Images from the Mars Odyssey orbiter showed seven dark, nearly circular spots between 100 meters (328 feet) and 250 meters (820 feet) wide on the slopes of the Arsia Mons volcano, located near the planet's highest peak.