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Published online 4 March 2004 | Nature | doi:10.1038/news040301-7
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More signs of water on ancient Mars
Opportunity rover finds further evidence of wet martian past.
NASA's Mars lander Opportunity has found minerals and rock formations that help to prove that the planet was once very wet.
"Liquid water once drenched the surface of Meridiani Planum," says Ed Weiler, NASA's associate administrator for space science.
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