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

There is mounting evidence that Mars, now cold and dry, had liquid water running across its surface much more recently than previously thought.

Scientists have long believed that Mars it 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 from just 700 million years ago, well into the current Amazonian period, posing a new puzzle to solve about the Red Planet and its history.

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