Mars' Subsurface May Hold Clues to Ancient Microbial Life, Study Suggests
A recent review in Astrobiology suggests that Mars' subsurface may have been a refuge for microbial life as the planet's atmosphere thinned and its surface became inhospitable billions of years ago. The study, led by Devan Nisson, explores the potential habitats and metabolisms that could exist underground, where conditions might be more favorable for life. The review highlights the challenges of searching for life on Mars, as the environments capable of sheltering life could lie meters or kilometers below the surface, beyond the reach of current spacecraft. The study emphasizes the need for future missions to explore deeper layers to uncover potential biosignatures. 
