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Nasa has obtained the clearest evidence yet that water flows on Mars, raising the possibility that the planet could be home to primitive life. Dr Seth Shostak is the Senior Astronomer and Director from California's SETI Institute (Search for ExtraTerrestrial Intelligence Institute) which is dedicated to scanning the cosmos listening for any signs of intelligent life in space. (Photo: An image generated by a computer from MRO data taken by an instrument aboard Nasa's Mars Reconnaissance Orbiter which shows dark, narrow, 100 metre-long streaks on the surface of Mars that scientists believe were caused by streams of salty water flowing during the planet's summer time; Credit: Nasa)
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