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For the first time, scientists have found evidence of a 'lake' of water on Mars. It sits under the planet's south polar ice cap, and is about 20km across. The discovery was made using Marsis, a radar instrument on board the European Space Agency's Mars Express orbiter. Â鶹Éç Minute's Ellie talks to space journalist Sarah Cruddas, about what this means for the potential for life on the Red Planet. (Photo: Mars seen from the Hubble Space Telescope. Credit: PA/NASA planetary photojournal)