Large volumes of water ice have probably been detected below Mars' surface, far from the planet's polar ice caps, scientists have said.The Sharad radar experiment, on Nasa's Mars Reconnaissance Orbiter (MRO) spacecraft made the discovery in Mars' mid-northern latitudes.
The ice is found in distinctive geological structures on Mars' surface that are hundreds of metres thick.
The radar data suggest that some of these features consist mostly of ice.
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