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The Waters of Mars

9/28/2015

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NASA's big announcement today is that NASA's Mars Reconnaissance Orbiter found evidence that strongly supports the longtime theory that salt water in liquid form flows down certain Martian slopes each summer!
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The dark streaks, known as recurring slope linae, have also been observed at Hale Crater. (Image: Jet Propulsion Laboratory/University of Arizona/NASA)
The source of the water is still a mystery. Scientists speculate it could be melting ice, an underground aquifer, or water vapor from the thin Martian atmosphere, or a combination thereof. Of course the biggest deal is, that finding water can have major implications for the possibility of life on Mars!
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A time-lapse animation of Palikir Crater, below, shows how the streaks extend and darken during warmer months on Mars, then gradually fade as temperatures cool. (image from NASA/Jet Propulsion Laboratory/University of Arizona)
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