Water-ice is seen to fade over time in this 12m crater within Arcadia PlanitiaFrom The BBC:
Large deposits of nearly pure water-ice may lurk just below the Martian surface, much nearer the equator than previously thought, suggest new images.
The pictures acquired by a Nasa orbiter show white material exposed by fresh meteorite impacts fading over time - behaviour expected of ice on Mars.
An onboard instrument also detected the tell-tale chemical signature of water.
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