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Two scientists studying data from NASA's Mars Reconnaissance Orbiter found signs of liquid water on the Red Planet as recently as 2 billion to 2.5 billion years ago, meaning water flowed there about a billion years longer than previous estimates.

NASA has found evidence that water flowed on Mars about a billion years longer than previous estimates. The new research from the US space agency reveals signs of liquid water on the Red Planet as recently as 2 billion to 2.5 billion years ago. Previously, it was believed that Mars rippled with rivers and ponds 3 billion years ago. 

Data from NASA's Mars Reconnaissance Orbiter reveals water flowed on Mars as recently as 2 billion to 2.5 billion years ago, say researchers at Caltech, Pasadena, California.

It is commonly believed that water on Mars evaporated about 3 billion years ago.But two scientists studying data from NASA's Mars Reconnaissance Orbiter found signs of liquid water on the Red Planet as recently as 2 billion to 2.5 billion years ...