Enormous Martian ocean evaporated into space

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NASA scientists have published details of a huge ocean that once covered half of Mars’ northern hemisphere but was lost to space over millennia. Writing in the journal Science, the astronomers explained how they used the ratio of two different kinds of water to estimate how wet the red planet was 4.5 billion years ago. “Early Mars (4.5 billion years ago) had a global equivalent water layer at least 137 meters deep,” they say. Martian water molecules are just like those on Earth—they’re made of one oxygen and two hydrogen atoms. But there are two kinds of hydrogen—the normal type, and one that’s a little heavier, called deuterium. Read 9 remaining paragraphs | Comments

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Enormous Martian ocean evaporated into space

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