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

Evidence is growing that Mars, now cold and dry, had liquid water running on its surface much more recently than previously thought.

Scientists have long believed that Mars was wet around 3 billion years ago, during the planet’s Hesperian period, then lost much of its water. But the 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 crack about the Red Planet and its history.

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