astronomicalwonders: Ancient Oceans on MarsIt is now widely accepted that Mars was once a very wet place. About four billion years ago Mars would have had enough water to cover its entire surface in a liquid layer about 140 metres deep. It is likely

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astronomicalwonders: Ancient Oceans on MarsIt is now widely accepted that Mars was once a very wet place. About four billion years ago Mars would have had enough water to cover its entire surface in a liquid layer about 140 metres deep. It is likely

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