New research suggests that Mars may have once had sandy beaches and a vast ocean, indicating a more habitable environment for life. Data collected by China's Zhurong Mars rover and analyzed by an international team of scientists revealed formations that strongly suggest the presence of an ancient northern ocean. The radar data showed a layered structure similar to Earth's beaches, supporting the idea of a dynamic, watery environment on Mars billions of years ago. The discovery strengthens the hypothesis that Mars's northern plains were once covered by oceans, providing potential locations to search for signs of ancient life.