Today, Mars is cold and dry. Billions of years ago, however, there was liquid water on its surface—and scientists have long been fascinated by what the planet could have been like at that time. A new study, published in Communications Earth and Environment on July 7, examines data from soil samples gathered by NASA’s Curiosity rover and compares them to similar soil on Earth. This provides a window into what the Martian surface was like billions of years ago—and the data suggests that it was that it was really a cold, wet wasteland of a planet.
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