NASA's Opportunity rover found enigmatic sulphate deposits at Meridiani Planum on Mars. A proposal that the deposits are sublimation leftovers of large ice-fields, similar in scale to those at the present-day polar caps, adds to the existing hypotheses.
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Hynek, B. Ancient equatorial ice on Mars?. Nature Geosci 2, 169–170 (2009). https://doi.org/10.1038/ngeo448
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DOI: https://doi.org/10.1038/ngeo448