Ancient Mars Had Vast Ocean, New Evidence Shows

National Geographic: A vast ocean chock-full of microbes may have once covered more than a third of Mars's surface, scientists say. The new evidence, from an analysis of dried-up Mars river deltas, adds to growing signs the red planet was once wet. elated: "Sulfur Dioxide Kept Ancient Mars Ocean Flowing.") On Earth, river deltas all lie at more or less the same elevation and reflect the current sea level. In fact, by estimating the elevations of ancient deltas, scientists can reconstruct how ......

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