The Red Planet May Once Have Been a Blue-Green Orb Like Earth

This is not a morality tale about planetary preservation – and what happens if you don’t take good care of your literal ground of being. But after years of assuming that Mars is and always had been inhospitable to life, scientists at NASA are now convinced that an ocean once covered 20% of the surface of Mars. In some places, the ocean was likely a mile in depth. And according to Charles Cockell, a professor of astrobiology at Edinburgh University, “The longer water persists on a planetary body in one location, particularly if there is geological turnover, the more likely it is that it would provide a habitable environment for a suitable duration for life to either originate or proliferate. An ocean would meet this need.”

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