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Mars has huge amounts of water hidden beneath its surface — and perhaps life too
Mars might hold enough subsurface water to cover its surface in a global ocean between 0.62 to 1.24 miles (1 to 2 kilometers) ...
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Ancient Beaches Found on Mars Reveal The Red Planet Once Had Oceans
The water history of Mars is a huge puzzle. At a glance, the planet looks as though it has never seen a drop ... allowing the generation of a three-dimensional map of structures deep below ground. A ...