Billions of years ago, Mars may have been a vastly different world, and scientists using the Perseverance rover are continuing to reveal the Red Planet’s ancient secrets.

A recent study published in the journal AGU Advances reports that rock samples collected from Jezero Crater on Mars may be older than the earliest evidence of life on Earth. These rocks contain minerals typically formed in water, leading scientists to speculate that they might hold the remnants of ancient Martian life, according to Interesting Engineering.