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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. ÃÛÑ¿´«Ã½ 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)