The BRICS TimesChinese Analysis Reveals Fine, Angular Grains Make Chang’e-6 Lunar Regolith Clump Differently
Unveiling the Sticky Secret of the Far Side
Chinese scientists have finally explained the unique stickiness of lunar soil from the moon’s far side. This followed detailed analysis of samples returned by the Chang’e-6 mission. The material was retrieved in 2024. It showed distinctly different behavior than soils from the moon’s near side. Its tendency to clump and resist flowing triggered a deep investigation. A research group from the Chinese Academy of Sciences led this study.
Lab Tests Confirm High Cohesiveness
The team conducted laboratory experiments to test the soil’s physical properties. They used angle-of-repose tests. These tests commonly assess how granular materials flow. Far-side samples showed a much steeper angle of repose. This clearly indicated much greater cohesiveness than near-side material. This finding was reported by CGTN
Fine Particles and Electrostatics are Key
Researchers determined that the lunar soil’s fine grain size is a main factor. Near-side regolith feels like sand texture-wise. However, the far-side particles resemble fine flour. They are much finer and prone to forming clumps. Microscopic analysis showed the grains are angular and rough. These conditions boost electrostatic forces. This further significantly increases the cohesion.
Environmental Differences Drive Composition
The team linked these differences to the lunar hemispheres’ contrasting environments. The moon’s far side lacks Earth’s magnetic field shielding effect. It is more exposed to charged particles and meteoroids. Frequent collisions and micro-impacts occur there. Plagioclase-rich highland rocks break down quickly. This generates abundant sharp, fine fragments. Space weathering then continuously reworks these fragments.
Implications for Future Missions
This relentless bombardment and constant electrostatic charging combine. The mineral composition also plays a role. It produces the distinctive, sticky lunar soil observed on the far side. These findings hold practical implications for future space missions. This includes landing operations and long-term infrastructure plans. The Chang’e-6 mission brought back 1.93 kilograms of material. It was from the South Pole–Aitken Basin. This basin is the largest and oldest known impact basin. It offers a rare look into far-side geological processes.
