China’s Zhurong rover suggests Mars had water more recently than thought

China's Zhurong rover has found that Mars may have had liquid water hundreds of millions of years more recently than previously thought. It has long been believed that Mars was wet around 3 billion years ago, during the planet's Hesperian period, then lost much of its water. But the new study, published in the journal Science Advances, presents evidence of water activity from just 700 million years ago, well into the current Amazonian period.