On June 1, 2024, China’s Chang’e-6 spacecraft touched down on the Moon’s South Pole-Aitken Basin, a place no mission had reached before. This region, shrouded in shadow, hides some of the oldest and coldest places in the solar system, preserving secrets about the Moon’s origins. As the spacecraft descended, it opened the door to unveiling lunar mysteries that have been buried for billions of years, including an anomaly that had puzzled scientists for years.
This moment was more than a scientific milestone—it was the beginning of a new chapter in space exploration.
Gravitational Puzzle
In 2019, NASA’s GRAIL mission detected a massive gravitational anomaly beneath the South Pole-Aitken Basin, the largest confirmed impact structure on the Moon. The anomaly was unlike anything previously detected, weighing as much as five times the size of Hawaii’s Big Island. At a depth of 300 kilometers (186 miles), this hidden mass had an unexpected influence on satellite orbits, leading scientists to wonder whether it was an ancient asteroid’s core or a deposit of frozen magma.
The gravitational pull from this anomaly sparked the need for further exploration to understand its true origin.
Basin History
The South Pole-Aitken Basin, formed 4.25 billion years ago by a colossal impact, is the oldest and largest confirmed crater on the Moon. Spanning 2,500 kilometers in diameter and plunging 8 kilometers deep, this basin offers a rare glimpse into the Moon’s inner structure. The materials excavated during the impact provide a unique record of the Moon’s formation, making this region an invaluable target for lunar research.
The Basin continues to be one of the most significant locations on the Moon for scientific exploration.
China’s Push
Since 2007, China’s Chang’e lunar program has been steadily advancing with each mission. The breakthrough came in 2020 when Chang’e-5 successfully brought back samples from the near side of the Moon. Building on this success, the program shifted focus to the far side and south pole, aiming to make history by sampling regions never before explored by any nation.
This ambitious plan set the stage for discoveries that could transform our understanding of the Moon.
The Excavation
China’s Chang’e-6 mission landed in the Apollo crater, a part of the South Pole-Aitken Basin, on June 1, 2024. The spacecraft used advanced robotic scoops and drills to collect 1,935.3 grams of lunar samples over 48 hours. These samples, the first from this remote region, were launched back to Earth and landed in Inner Mongolia on June 25, 2024, opening a new chapter in lunar research.
The successful collection and return of these samples provided scientists with unprecedented material for study.
Regional Significance
The Apollo crater lies within the South Pole-Aitken Basin, the oldest and largest impact basin on the Moon. This region’s unique geology could offer insights into the Moon’s mantle and crust, providing a wealth of information not available from other lunar locations. Additionally, the south pole’s shadowed craters are potential reservoirs of water ice, which could play a crucial role in future lunar missions.
This discovery has deepened interest in the Moon’s south pole, making it a focal point for future exploration.
Scientists React
Peter B. James, lead author of the 2019 gravitational study, described the discovery as “like detecting a metal pile five times larger than Hawaii’s Big Island buried beneath the surface.” His team’s work sparked intense interest in physically sampling the region, aiming to determine whether the anomaly is from asteroid remnants or ancient volcanic activity, further deepening the mystery surrounding the Moon’s south pole.
His comments underscored the excitement and curiosity generated by the discovery.
International Response
NASA and the European Space Agency have shown interest in collaborating on lunar south pole exploration. The Artemis program, aiming to establish a lunar base in the 2030s, views China’s recent sample collection as strategically important. As nations race to explore the Moon’s south pole, the future of lunar resource rights remains uncertain, and international collaboration or competition could shape the next phase of space exploration.
This collaboration highlights the growing international interest in the Moon’s south pole.
Sample Analysis
After bringing the samples back to Earth, Chinese laboratories used advanced techniques like spectroscopy and microscopy to analyze them. The focus was on identifying the mineral compositions, isotopic ratios, and magnetic properties that could provide clues to the region’s formation history. This groundbreaking work represented the first analysis of lunar materials from the far side’s south pole, offering an unprecedented opportunity for scientific comparison.
These materials promise to reshape our understanding of the Moon’s composition.
Rust Discovery
In November 2025, Chinese researchers made an astounding discovery: they identified crystalline hematite and maghemite in the lunar samples. These oxidized iron minerals, commonly known as rust, had never been found on the Moon before. This discovery challenged the long-held belief that the Moon’s surface remained reduced due to the absence of water and atmosphere, shaking up lunar geology.
This breakthrough has sent shockwaves through the scientific community.
Scientific Puzzlement
The presence of oxidized minerals on the Moon, which lacks water and atmosphere, left researchers perplexed. Decades of Apollo-era studies had suggested the lunar surface should be chemically reduced, making the discovery of rust-like minerals an enigma. Scientists raced to develop new theories to explain how these oxidized compounds could form on the airless Moon, opening new debates in planetary chemistry.
This puzzling discovery has prompted new investigations into lunar surface chemistry.
Formation Theory
After much analysis, scientists concluded that asteroid impacts might temporarily create oxygen-rich environments. These brief spikes in oxygen allowed minerals like hematite and maghemite to form, despite the Moon’s typically low oxygen conditions. The theory proposes that these oxidized minerals crystallize during these fleeting moments before the environment returns to its reduced state, explaining the surprising discovery of rust.
The theory provides a plausible explanation for how such minerals could exist on the Moon.
Composition Insights
The discovery of hematite and maghemite deviated from the expected composition of lunar basalt, the dominant material on the Moon’s surface. These minerals, with unique magnetic properties and crystal structures, suggest that impact-generated processes on the Moon create localized geochemical conditions that differ from the Moon’s typical basaltic composition. This finding has major implications for our understanding of lunar geology.
This discovery has opened new doors for research into the Moon’s geological processes.
Expert Outlook
Scientists are cautious about linking the surface mineral findings to the deep gravitational anomaly detected in 2019. The oxidized minerals are present in surface and near-surface samples, while the anomaly lies 300 kilometers beneath the Moon’s surface. Researchers caution that further drilling missions are necessary to explore whether there’s a connection between the surface minerals and the deep subterranean mass.
Further exploration is needed to determine the full extent of these findings.
Future Missions
In mid-2026, China plans to launch the Chang’e-7 mission, which will deploy a hopping rover and a mini-flying probe to search for water ice in the permanently shadowed craters at the south pole. The mission aims to study subsurface structures using advanced tools like ground-penetrating radar, placing China at the forefront of lunar exploration and increasing international competition for the Moon’s resources.
The Chang’e-7 mission will help push the boundaries of lunar exploration even further.
Geopolitical Implications
The success of Chang’e-6 raises concerns about China’s growing capabilities in space, particularly in cislunar space. U.S. policymakers have accelerated the Artemis program to remain competitive, especially as water ice deposits at the south pole could support a long-term human presence on the Moon. As nations vie for lunar dominance, the Moon’s resources become increasingly important for future space exploration.
This competition has escalated the global space race to unprecedented levels.
International Protocols
The Outer Space Treaty of 1967 prohibits national appropriation of celestial bodies, but there are significant legal ambiguities surrounding resource extraction. As multiple nations, including China and the U.S., develop lunar exploration capabilities, there’s a pressing need for international agreements on resource utilization. The United Nations Committee on the Peaceful Uses of Outer Space continues to debate governance mechanisms for lunar mining, with no consensus yet.
The lack of clear legal frameworks has added urgency to the discussion on lunar resource rights.
Magnetic Mysteries
The discovery of rust-like minerals could help explain magnetic anomalies detected across the South Pole-Aitken Basin. While the Moon lacks a global magnetic field, localized magnetic signatures suggest ancient magnetization processes. The ferromagnetic properties of hematite and maghemite could provide insights into the Moon’s magnetic history, helping scientists understand how these regions were magnetized in the past.
This discovery may provide new insights into the Moon’s magnetic field history.
Construction Applications
Researchers are already considering how the discovery of oxidized minerals could influence future lunar base construction. The presence of iron oxides suggests potential pathways for in-situ resource utilization, such as producing construction materials, oxygen, and even water. China’s goal of landing astronauts on the Moon by 2030 underscores the importance of understanding lunar mineralogy for building sustainable habitats on the Moon.
This new knowledge of lunar minerals could be crucial for future space missions.
Paradigm Shift
The findings of Chang’e-6 have shown that the Moon still holds many surprises. The discovery that massive asteroid impacts can create temporary oxidizing environments has forced a reevaluation of lunar geochemistry. This breakthrough not only challenges long-standing assumptions about the Moon but could also reshape our understanding of planetary science across the solar system, while intensifying the competition for lunar resources.
The Moon’s hidden secrets continue to shape the future of space exploration.