NASA scientists have said that there are seasonal streams of liquid water flowing across the surface of the Red Planet, if confirmed the evidence gathered by Mars Reconnaissance Orbiter would be the first discovery of active liquid water. 
In fact, it was US space agency NASA which said that pictures taken from its Mars Reconnaissance Orbiter spacecraft showed finger-like features which may be flows of salty water spilling over the rims of craters. Lujendra Ojha and colleagues at the University of Arizona now claim that, if confirmed, the discovery could finally help establish whether life could be sustained on Mars.
"I was baffled when I first saw those features. We soon realised they were different from slope streaks that had been observed before. These were highly seasonal and we observed some of them had grown by more than 200 metres in a matter of just two Earth months," Jha said.
His colleague, Dr Alfred McEwen said the markings were "a mystery now, but a solvable mystery".
"The best explanation we have for these observations so far is a flow of briny water, although this study does not prove that," he said.
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