Introduction: A Planet That Wasn’t Always Red and Barren Today, Mars is a cold, dry desert with a thin atmosphere and no stable liquid water on its surface. But billions of years ago, it may have looked very different. Scientists now believe that ancient Mars had rivers, lakes, and possibly even oceans—raising one of the most compelling questions in modern science: Did life once exist on Mars? Understanding the possibility of past life on Mars isn’t just about curiosity. It...Click for full post