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Scientists at Nasa say they think they've identified new evidence of flowing water on Mars, the crucial component for sustainable life - and potential human colonisation one day.
Nasa have tweeted a short video outlining the key points of the discovery of liquid, salty, water on the surface of Mars.
"Mars is not the dry, arid planet we thought of in the past," Nasa says.
Photographs released by Nasa show the dark, narrow streaks that scientists say are formed by the flow of briny, liquid water across the surface of Mars.
The experts are unsure where the water comes from, but think it may rise up from underground ice or salty aquifers, or condense out of the thin Martian atmosphere.