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In particular, it has been suggested that a great ocean covered the martian lowlands in the northern hemisphere during the Noachian and Early Hesperian epochs, 4.6 to 3.6 billion years ago.

According to NASA, it’s a rare and invaluable find that likely dates back at least 3.9 billion years to the Noachian era —a time when Mars was heavily bombarded, forming much of the cratered ...