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Is it possible that there are underground seas on Mars?

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Yes, for relatively loose interpretations of the word “seas”. We have extremely good evidence that water exists on Mars, and not far from the surface. Water on Mars - Wikipedia Some may occasionally actually reach the surface. read more

Features shown by the Viking orbiters in 1976, revealed two possible ancient shorelines near the pole, Arabia and Deuteronilus, each thousands of kilometers long. Several physical features in the present geography of Mars suggest the past existence of a primordial ocean. read more

There were long-standing bodies of water: lakes, deltas and perhaps even seas,” he said. “It seems to me that we have excellent evidence that Mars was once habitable, though whether it was ever inhabited is not clear. read more

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