NASA Discovers Evidence Of Flowing Water On Mars

NASA first found signs of water on Mars more than a decade ago, but earlier indications were that any existing water would be frozen and concentrated at the poles.

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.