Core Viewpoint - Recent research indicates that significant water activity existed on Mars approximately 750 million years ago, extending the planet's history of water presence and providing new insights into its climate evolution, geological processes, and potential habitability for life [1][3]. Group 1 - The previous scientific consensus suggested that Mars entered a dry phase around 3 billion years ago [3]. - The Zhurong rover has traveled about 1.9 kilometers since its landing in May 2021 and utilized high-frequency radar for subsurface exploration, akin to a detailed CT scan of Mars [3]. - Data revealed a uniform sediment layer approximately 4 meters thick covering the landing area, indicating a water deposition environment similar to shallow seas or large lakes, rather than volcanic or wind-driven processes [3]. Group 2 - Radar observations captured centimeter-thick sedimentary layers resembling those formed in surface water environments, further supporting the existence of shallow water conditions in the area [3]. - Through crater dating analysis, researchers determined that the sediment layers formed around 750 million years ago, during the late Amazonian epoch of Mars [3]. - The analysis suggests that the landing area experienced significant surface reshaping during the late Amazonian period, with ongoing water activity at that time [3].