Researchers analyzing samples returned by China’s Chang’e-6 mission have identified seven microscopic fragments with chemical compositions matching rare, water-rich CI chondrite asteroids. This discovery, reported in a 2025 study, suggests that such fragile bodies bombarded the Earth–Moon system more frequently throughout history than the existing meteorite record previously indicated.
Evidence of CI-like Chondrites in Apollo Basin Samples
The Chang’e-6 mission achieved a milestone by returning the first samples from the Moon’s far side. After the return capsule landed in Inner Mongolia on June 25, 2024, scientists began examining the material for signs of exogenous matter—debris delivered to the lunar surface from external sources. Among more than 5,000 fragments sifted by researchers, seven distinct grains were identified as olivine-bearing clasts
that do not match the chemical makeup of lunar bedrock.
According to the research, these fragments are interpreted as Impactor relics of CI-like chondrites in Chang’e-6 lunar samples
, a finding detailed in a 2025 paper published in the Proceedings of the National Academy of Sciences. The team, led by Jintuan Wang and Zhiming Chen, utilized mineral chemistry and isotope analysis to confirm the fragments’ origins. These relics are notable for their hydrated minerals, carbon-bearing material, and carbonates—substances typically found in primitive CI chondrites, which are often treated as close references for the bulk chemistry of the early solar system but are rarely preserved in lunar environments due to the intensity of impact events.
Geological Significance of the South Pole-Aitken Basin
The location of the collection site provides essential context for why these fragments survived. The Chang’e-6 mission targeted the Apollo Basin, which sits within the much larger South Pole-Aitken Basin. As reported by the Space Daily editorial team, this region represents one of the largest and oldest impact structures on the Moon. Because the area has been subjected to billions of years of geological churning, the regolith acts as a natural archive of both local volcanic activity and debris from objects that struck the Moon across deep time.
Identifying these relics requires precision because impact events on the Moon generally melt or destroy incoming material. The researchers specifically looked for clasts that retained enough chemical memory
to be distinguished from the surrounding lunar regolith. The fact that these seven fragments were identified suggests that the lunar surface may hold a more complete history of asteroid bombardment than researchers have been able to verify through Earth’s own, often incomplete, meteorite record.
Distinguishing Scientific Discovery from Popular Culture
It is important to distinguish this cultural reference from the scientific report regarding the seven asteroid fragments identified by the Chang’e-6 research team.
The primary scientific focus remains on the implications of the CI-chondrite discovery. By confirming the presence of these water-rich materials on the lunar far side, the study provides a new baseline for understanding the flux of primitive asteroids in the inner solar system.
Keep reading