A Giant Hole in the Martian Atmosphere Is Venting All Its Water into Space

There's a hole in the Martian atmosphere that opens once every two years, venting the planet's limited water supply into space — and dumping the rest of the water at the planet's poles. That's the explanation advanced by a team of Russian and German scientists who studied the odd behavior of water on the Red Planet. Earthbound scientists can see that there's water vapor high in the Martian atmosphere, and that water is migrating to the planet's poles. But until now, there was no good explanation for how the Martian water cycle works, or why the once-drenched planet is now a dry husk.

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