The stream of revelations from Mars continues. The latest news — the discovery of clays in ancient terrains — helps to fill in the picture of the past existence of liquid water on the planet's surface.
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Newsom, H. Clays in the history of Mars. Nature 438, 570–571 (2005). https://doi.org/10.1038/438570a
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DOI: https://doi.org/10.1038/438570a
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