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Nature 438, 570-571 (1 December 2005) | doi:10.1038/438570a; Published online 30 November 2005

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Planetary science: Clays in the history of Mars

Horton Newsom1

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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.

Thanks to three orbiting spacecraft and two rovers that continue to return data, we now have a great deal of evidence that abundant surface water once existed on Mars. But until now something has been missing.

  1. Horton Newsom is in the Institute of Meteoritics and the Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA.
    Email: newsom@unm.edu

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