NASA finds new evidence of liquid water on Mars - Yahoo! News: "NASA scientists believe that if there is liquid water on Mars, it would be highly salty and lie beneath the surface. That would explain why it would not freeze in the planet's frigid surface temperatures, which can fall to around 200 degrees below zero Fahrenheit (minus 128 degrees Celsius), or evaporate in its low air pressure.
'It is more like a syrup, maybe, in how it flows,' said Alfred McEwen of the University of Arizona, Tucson, principal investigator in charge of a special camera on the Mars orbiter called a High Resolution Imaging Science Experiment."