Core Insights - The research team has successfully updated the lunar impact crater dating model based on samples from the Chang'e 6 mission, confirming that the impact frequency on the Moon's front and back is consistent, and revealing a smooth decay trend in early lunar impact events rather than the previously hypothesized dramatic fluctuations [1][2]. Group 1: Research Findings - The age of the lunar surface is crucial for understanding its evolutionary history, with scientists traditionally estimating ages based on the density of impact craters [1]. - The Chang'e 6 mission returned 1935 grams of lunar soil samples from the Apollo basin in the South Pole-Aitken basin, providing key rock samples: a 2.807 billion-year-old basalt and a 4.25 billion-year-old ancient rock formed from magma crystallized by a large impact event [1][2]. - The new model indicates that the impact crater density data from the Moon's far side aligns perfectly with the confidence interval of the model established from the near side samples, suggesting a uniform impact flux across the Moon [2]. Group 2: Implications of the Research - The study challenges the "sawtooth model" or "late heavy bombardment" hypothesis, supporting the idea that the early impact frequency on the Moon was a smooth and rapid decay process [2]. - This research fundamentally updates the understanding of lunar impact history and highlights the significance of the Chang'e 6 samples, providing a more precise scale for future lunar and solar system celestial body dating studies [2].

Core Viewpoint - The research team has successfully updated the lunar impact crater dating model based on samples from the Chang'e 6 mission, confirming that the impact frequency on the Moon's front and back is consistent, and revealing a smooth decay trend in early lunar impact events rather than the previously hypothesized violent fluctuations [1][2]. Group 1: Research Findings - The study utilized high-resolution remote sensing images to systematically analyze the impact crater density in the Chang'e 6 landing area and the entire South Pole-Aitken Basin, integrating historical sample data from the Apollo program, Chang'e 5, and others to construct a new lunar impact crater chronology model [2]. - The results indicate that the impact crater density data from the Moon's far side aligns perfectly within the confidence interval of the model established from front-side samples, suggesting a uniform impact flux across both sides of the Moon [2]. - The new model provides fresh insights into the early impact history of the Moon, showing that the age data from the South Pole-Aitken Basin significantly deviates from the "zigzag model" or "late heavy bombardment" hypothesis, supporting a smooth and rapid decay in early impact frequency [2]. Group 2: Implications for Future Research - This research fundamentally updates the understanding of the Moon's impact history, highlighting the key value of the Chang'e 6 samples and providing a more precise scale for future chronological studies of the Moon and other celestial bodies in the solar system [2].