Not all the water on Mars was frozen in polar icecaps billions of years ago. Photographs taken from NASA's Reconnaissance Orbiter reveal that there is liquid water, even today, on the surface of the Red Planet. That's according to a paper published today in the journal Nature Geoscience — and the finding is re-igniting an age-old question: is Mars home to some form of life? Ian O'Neill is an astrophysicist and space science producer for Discovery News.
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