With revisions, he believes the outer shoreline will prove correct, too. As the interior of Mars cooled, the layer of ice covering the land and ocean thickened. Eventually the ocean froze entirely, though occasionally, still-liquid groundwater beneath the ice burst through, unleashing gigantic floods that pooled into temporary lakes and seas. Liquid water might yet flow today several miles underground, which intrigues biologists, because any Mars microbes could conceivably still teem there. Follow the water, and it may lead to life.
Some scientists see ancient coastlines on Mars.
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