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Nature 417, 234-235 (16 May 2002) | doi:10.1038/417234a

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Planetary science: A wet and altered Mars

John F. Mustard

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Has Mars always been cold and dry or was it once warm and wet? Reanalysis of spacecraft data reveals a signature from the surface rocks that indicates their composition has been altered in the presence of water.

Two years ago, Bandfield et al.1 published interpretations of data from an instrument on the Mars Global Surveyor spacecraft that caused many planetary scientists to rethink their ideas about the geological evolution of the red planet. On page 263 of this issue, Wyatt and McSween2 describe how they have reinterpreted the same data and arrived at a fundamentally different view.