Water may have been on Mars much more recently than scientists thought, Chinese rover suggests

There is growing evidence that Mars, now cold and dry, had liquid water flowing over its surface much more recently than previously thought.

Scientists have long believed that March was wet about 3 billion years ago, during the planet’s Hesperian period, and then lost much of its water. But a new study presents evidence of water activity just 700 million years ago, well into the current Amazon period, posing a new puzzle to solve about the Red Planet and its history.

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