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Dip! Ancient Mars had enough water for a world ocean 300 meters deep

Dip! Ancient Mars had enough water for a world ocean 300 meters deep

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In the normal course of everyday life, we tend to think of the planets as immobile and unchanging. There are few things more reliable than the ground beneath our feet, but that’s only because our experiences are time-limited. Over fairly long time scales – even brief ones, in geologic time – we see worlds constantly …

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Mars once had enough water for a planetary ocean 300 meters deep

Mars once had enough water for a planetary ocean 300 meters deep

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Today, Mars is colloquially known as the “Red Planet” due to its dry, dusty landscape rich in iron oxide (aka “rust”). Additionally, the atmosphere is extremely thin and cold, and no water can exist on the surface in any form other than ice. But as the Martian landscape and other evidence attests, Mars was once …

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