Chang’e-6 probe reveals new clues about the enigmatic lunar dichotomy, scientists confirm

The Chinese mission Chang’e-6 has brought to light crucial new evidence about the origin of the sharp difference between the two faces of Lua. A recent study, published after analyzing the unprecedented samples collected, indicates that an impact of gigantic proportions permanently altered the composition of the lunar mantle. Esta discovery deepens understanding of the internal and superficial evolution of our natural satellite.

The in-depth investigation, led by renowned scientists from Instituto of Geologia and Geofísica of Academia Chinesa of Ciências, is based on high-precision isotopic analysis. The samples were collected directly from the basalts of the Aitken basin of the Polo Sul, considered the largest and oldest lunar impact crater. The work was published in detail in the prestigious scientific journal *Proceedings of the National Academy of Sciences (PNAS)*, reinforcing the importance of the findings for the global astronomical community.

The implications of this data are vast, rewriting parts of the geological history of Lua. The results provide a solid foundation for future research into planetary formation and how catastrophic events shape celestial bodies over billions of years.

The profound lunar dichotomy

The surface of Lua is famously divided into two distinct faces: the visible face, which is always facing Terra, and the hidden face, which remains hidden from our view. The visible face is characterized by vast dark basalt plains, known as lunar “seas”, which are the result of ancient volcanic eruptions. Essas areas contrast strongly with the hidden face, which displays a much more rugged relief, with a greater density of craters and few dark “seas”.

This dichotomy has always intrigued scientists, who seek to understand the forces and events that led to such a striking asymmetry. Diversas theories have been proposed over the years, including different crustal compositions, Terra gravitational tidal effects, and asymmetric impact events. The new Chang’e-6 research adds a key piece to this puzzle, suggesting that a primordial cataclysmic event was the primary driver of this differentiation.

Variation in the composition of the lunar mantle, as revealed by the Chang’e-6 samples, is a determining factor in surface geology. The lower volcanic activity on the hidden face is now more understandable, given the depletion of elements essential for magma generation.

The crucial role of the Aitken basin

The Aitken basin of Polo Sul, from which Chang’e-6 obtained its samples, is a site of unprecedented geological interest. With a diameter of approximately 2,500 kilometers and a depth of 8.2 kilometers, it is one of the largest and oldest known impact structures in the solar system, formed around 4.2 billion years ago. Its location on the hidden side of Lua makes it a natural laboratory for studying the satellite’s primordial conditions, far from influences that could have affected the visible side.

The choice of this location for sample collection was not random. Cientistas hoped that the material there might contain untouched information about the deep mantle of Lua, exposed by the massive impact. The Chang’e-6 samples are the first to be collected directly from this critical region, offering a unique window into the lunar past and its transformations.

Isotope analysis and the primordial impact

Researchers made an important discovery when analyzing samples from the far side: the presence of significantly higher proportions of the heavy isotope potassium. Essa concentration appears to be much higher compared to lunar rocks that were collected on previous NASA missions, such as those in the Apollo series, which focused mainly on the visible face of Lua. The precision of the isotopic analysis allowed scientists to rule out other factors that could influence the composition, such as irradiation by cosmic rays or secondary magmatic processes that occurred later in lunar history.

The conclusion is that a large impact, which occurred more than 4.2 billion years ago, was responsible for a massive loss of moderately volatile elements in the lunar mantle. The extreme temperature and pressure conditions generated during this cataclysmic event would have favored the evaporation of the lighter potassium isotopes, lastingly altering the satellite’s internal chemistry. Esta change is seen as a key factor in understanding the differences observed between the two faces of Lua, explaining the lower volcanic activity and more rugged relief on the hidden face, in contrast to the extensive basalt plains seen on the hemisphere facing The data suggests that the absence of these volatiles made the generation of magma difficult, resulting in the landscape we observe today.

Implications for lunar geology

Understanding how large impacts influence not only the surface, but also the internal evolution of a celestial body, is fundamental. Esta research demonstrates that violent events can have long-term consequences on the chemistry and geodynamics of planets and moons. The loss of volatiles on the hidden face of Lua directly affected the ability to generate magma, leading to the absence of the basaltic “seas” that characterize the visible face.

This finding has implications for the study of other planetary bodies that also exhibit geological dichotomies or asymmetries. The Chang’e-6 methodology and conclusions can be applied to reevaluate the formation and evolution of other worlds, providing a new lens for interpreting data from future and past space missions.

Advances in the Chinese space program

The Chang’e-6 mission, launched in May 2024, marked a historic milestone by being the first to collect samples from the hidden face of Lua. The success of this venture highlights China’s growing technological capacity and investment in space exploration. The Asian country has an ambitious lunar program, which includes a series of unmanned missions and future plans for manned exploration.

The Chang’e program is named after the goddess of Lua in Chinese mythology and has achieved remarkable feats. Além from In the field of planetary exploration, the mission Tianwen-1 to Marte made China the third nation to achieve Planeta Vermelho, following in the footsteps of the Estados Unidos and the extinct União Soviética. Estes efforts demonstrate a long-term strategy to establish itself as a leading power in space exploration, seeking to advance scientific knowledge and develop new technologies.

Next steps in exploration

The future of Chinese lunar exploration includes even more ambitious missions. Chang’e-7 is scheduled for 2026 and will target the south pole of Lua, a region of great interest due to the potential presence of water ice. Chang’e-8, scheduled for 2029, will involve the participation of 11 countries and will be fundamental in laying the foundations for future manned missions, including the possible construction of a lunar research station.