The Mars rover Curiosity has collected new soil samples that suggest the Gale Crater once held a salty lake about 3.7 billion years ago, according to findings published in Nature Geoscience. Curiosity's latest find after digging deep into the crater's bedrock points to a large range of salts that haven't been found elsewhere on the Red Planet, researchers say.
Curiosity finds more clues to salty lake in Gale Crater's past
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