Potentially life-giving water still flows across the ancient surface of Mars from time to time, NASA scientists said Monday in revealing a potential breakthrough in both the search for life beyond Earth and human hopes to one day travel there. While the discovery doesn't by itself offer evidence of life on Mars, either past or present, it does boost hopes that the harsh landscape still offers some refuge for microbes to cling to existence. The existence of liquid water, even if it is super salty briny water, gives the possibility that if there's life on Mars, that we have a way to describe how it might survive," said John Grunsfeld, associate administrator for the Science Mission Directorate at NASA. NASA researchers using an imager aboard the Mars Reconnaissance Orbiter confirmed the watery flows by looking at light waves returned from seasonal dark streaks on the surface, long suspected to be associated with liquid water. It remains unclear where the water comes from. Alfred McEwen, who heads up NASA's HiRISE high-resolution camera aboard the Mars orbiter, said he's fairly confident life will one day be found on Mars. "It's very likely, I think, that there's life somewhere in the crust of Mars, microbes," he said. Jim Green, director of planetary science at NASA, said the discovery announced Monday puts NASA in a perfect position to look for that life.