Caption: 
An SwRI scientist studied the antifreeze properties of exotic salts that exist on Mars, which could allow brines to remain liquid down to -103 degrees Fahrenheit. The studies show how a mile below the Martian south polar cap, brines between the grains of ice or sediments could produce the strong reflections detected by the radar instrument aboard ESA’s Mars Express orbiter.

Credit: 
NASA/JPL-Caltech/USGS/SwRI