Colliding Molecules in Mars’ Atmosphere May Solve an Ancient Climate Mystery

Climate change on Earth is a well-established phenomenon, but scientists have long struggled to explain an even more dramatic change of conditions, long ago in a far-off land.

Mars is a dry, frigid planet today, with an average ground temperature of about -60 °C. Liquid water seems to be possible only under a narrow range of circumstances, but for the most part, water sublimates directly from solid ice to gaseous water vapor. And yet, features on the surface of Mars tell a very different

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