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Liquid water carved deep canyons on Mars: Scientists
Dramatic climate cycles on early Mars, triggered by buildup of greenhouse gases, may have caused liquid water to carve out deep canyons and extensive valley networks on the red planet's surface, scientists including one of Indian origin have found. Scientists have long debated how these canyons and 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.

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