Unveiling the Moon's Secrets: Chinese Scientists Revolutionize Lunar Dating with Chang'e-6 Samples
BEIJING, Feb. 8 (Xinhua) - In a groundbreaking discovery, scientists have revealed a consistent pattern of impact cratering on the moon's near and far sides, marking a significant leap forward in our understanding of lunar history. This achievement, made possible by the Chang'e-6 mission, challenges long-held assumptions and paves the way for a unified lunar chronology system.
The Chinese Academy of Sciences' Institute of Geology and Geophysics, led by a dedicated research team, has made a remarkable breakthrough in lunar science. By meticulously analyzing remote sensing images, they have revised the decades-old lunar impact crater chronology model, offering a more accurate and comprehensive understanding of the moon's geological past.
The study, published in Science Advances, reveals a consistent impact flux across both lunar hemispheres. Contrary to previous beliefs, early lunar impact events followed a gradual decline rather than dramatic fluctuations. This discovery is pivotal as it provides a more precise method for determining the age of the moon's surface, which is essential for comprehending its geological evolution.
For decades, scientists have relied on impact crater density to estimate the age of unsampled lunar regions. However, the existing crater chronology method had a significant limitation: it was based solely on samples from the moon's near side, with the oldest specimens dating back only 4 billion years. This constraint sparked ongoing debates about the moon's early impact history, including the Late Heavy Bombardment hypothesis.
The turning point came in June 2024 when China's Chang'e-6 mission successfully returned 1,935 grams of lunar samples from the Apollo Basin, located on the moon's far side within the South Pole-Aitken Basin. These samples, comprising young basalt aged 2.807 billion years and ancient norite formed 4.25 billion years ago, provided a critical anchor point for reconstructing the moon's early history.
The researchers employed high-resolution remote sensing imagery to map crater densities across the Chang'e-6 landing area and the broader South Pole-Aitken Basin. By integrating this new data with historical samples from the Apollo, Luna, and Chang'e-5 missions, they constructed a more comprehensive lunar impact chronology model.
The results were remarkable. The crater density data from the moon's far side aligned perfectly with the confidence interval of the near-side-derived model. This discovery indicates a homogeneous impact flux across the entire moon, offering a reliable foundation for a unified global lunar chronology. Yue Zongyu, the study's lead author, emphasized the significance of this finding, highlighting its potential to revolutionize our understanding of lunar impact history and the scientific value of the Chang'e-6 samples.
This refined chronology will serve as a more accurate reference not only for lunar studies but also for dating the surfaces of other planetary bodies in our solar system. The Chang'e-6 mission has unlocked a new era of lunar exploration, where the mysteries of our celestial neighbor are gradually being revealed.
