The water on Mars vanished. This might be where it went. - Chicago Tribune

The problem with that story, said Renyu Hu, a scientist at NASA’s Jet Propulsion Laboratory and another author of the current Science paper, is that Mars has not been losing hydrogen fast enough. Measurements by NASA’s Mars Atmosphere and Volatile Evolution orbiter, or MAVEN, have showed that the current rate, extrapolated over 4 billion years, “can only account for a small fraction of the water loss,” Hu said. “This is not enough to explain the great drying of Mars.”

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