Bone-dry Mars?

6:21am, November 5, 2003

Finding only trace amounts of carbonate minerals on Mars isn't the only strike against the hypothesis that most of the Red Planet was once wet and warm (see "Martian Invasion," in this week's issue: Martian Invasion). The presence of large amounts of olivine, a mineral that undergoes rapid transformation into other minerals when exposed to liquid water, also argues against ancient oceans or lakes on Mars.

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