For the first time, scientists have discovered evidence of an ancient mud deposit on the planet Mars. This new discovery, which was published in the journal Science, suggests that the Red Planet may have been a much wetter and warmer place than previously thought. The mud deposit dates back at least 3.7 billion years, and was probably formed when water flowing down from the Martian highlands flowed into a large lake. The mud deposit was likely the product of a complex water system that likely included rivers, lakes, and wetlands. The findings open up the possibility that life may have existed on Mars at some point in its history.

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source: Phys.org