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Mars, once a planet teeming with vast amounts of water, is now a dry, desolate landscape. The evidence for this transformation lies in the planets surface features, which suggest that water once flowed freely. Over the past 3 billion years, some of that water has seeped deep underground. But what happened to the rest? This question has puzzled scientists for years. Thanks to NASAs Hubble Space Telescope and the Mars Atmosphere and Volatile Evolution (MAVEN) missions, were now closer than ever to unraveling this mystery. John Clarke, a researcher at Boston Universitys Center for Space Physi