Mars' Jezero Crater Rocks Show Water Signs, May Predate Earth Life

A study published in AGU Advances reveals that seven rock samples collected from Mars' Jezero Crater by NASA's Perseverance rover contain minerals typically formed in water. The findings indicate that these rocks were likely deposited by water or formed in its presence, supporting the idea that the crater once held a habitable, watery environment.

The samples, collected in 2022 during the rover's exploration of the crater's western slope, were analyzed by scientists from MIT and NASA. The team found evidence of minerals such as carbonates and sulfates, which form in water and could preserve signs of ancient life. Some of the rocks may have been deposited in an ancient lake more than 3.5 billion years ago, predating the earliest signs of life on Earth.

While the presence of organic matter—potential indicators of life—has not been confirmed by the rover's instruments, the mineral composition of the samples makes them prime candidates for future analysis on Earth. Researchers believe these rocks could hold the best chance of revealing evidence of past Martian life once they are returned for more detailed study.

The study's lead author, Tanja Bosak, emphasized that the findings confirm the existence of habitable environments on Mars. She noted that the presence of water was likely sufficient to create large sedimentary deposits. Benjamin Weiss, a co-author, called the samples the oldest ever analyzed that may have been formed by water, making them highly promising for preserving any potential fossilized life.