8. The Subsurface of Mars
Mars’s surface is battered by intense radiation, but scientists believe that life could persist underground, protected from these harsh conditions. Rovers and orbiters are actively searching for signs of liquid water and chemical signatures below the surface—potential indicators of microbial life. Finding such evidence would transform our understanding of Mars and its habitability, offering hope that life might be hiding just beneath the planet’s dusty exterior. Read more at Science.