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Climate cycles may explain how running water carved Mars' surface features


 UNIVERSITY PARK, Pa. — Dramatic climate cycles on early Mars, triggered by buildup of greenhouse gases, may be the key to understanding how liquid water left its mark on the planet's surface, according to a team of planetary scientists.

Scientists have long debated how deep canyons and extensive valley networks — like the kinds carved by running water over millions of years on Earth — could form on Mars some 3.8 billion years ago, a time many believe the planet was frozen.

The researchers suggest a glacier-covered early Mars could have experienced long warm periods, lasting up to 10 million years at a time, caused by a thick atmosphere of carbon dioxide and hydrogen.

The team, which published its findings today (Dec. 1) in the journal Earth and Planetary Science Letters, found the warming cycles would have lasted long enough, and produced enough water, to create the features.  More

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