Chang’e Lunar Samples Reveal Organic Matter Evolution in Solar System

An international research team has identified multiple nitrogen-bearing organic species on the surfaces of lunar soil grains, providing new insights into how organic matter evolves on the Moon and within the solar system. The findings are based on the analysis of lunar soil samples returned by China’s Chang’e-5 and Chang’e-6 missions.

The study was led by the Institute of Geology and Geophysics at the Chinese Academy of Sciences, in collaboration with researchers from the University of New Mexico, Changsha University of Science and Technology, and other institutions. According to a report by China Science Daily on April 11, 2026, the research systematically identifies these organic species for the first time on the surfaces of lunar soil grains.

The Moon as a Solar System Time Capsule

The research highlights the Moon’s role as a natural time capsule for the inner solar system. While asteroids and comets acted as couriers in the early solar system, delivering organic matter and bioessential elements—including carbon, nitrogen, oxygen, phosphorus, and sulfur—to terrestrial planets, these records are largely absent on Earth.

On Earth, extensive biological processes and geological activity have erased the direct records of these early extraterrestrial inputs. Because the Moon has relatively limited geological activity, We see more likely to preserve evidence of the delivery and subsequent evolution of this exogenous organic matter.

The results of the Chang’e-5 and Chang’e-6 sample analysis demonstrate that the Moon records both the history of organic delivery from small bodies and the subsequent modification of those materials. This modification occurs through impacts and irradiation on the airless body of the Moon.

Analyzing Nitrogen-Bearing Organic Matter

Although previous analyses of Apollo lunar soils had detected the presence of carbon and nitrogen, the specific morphology, origin, and preservation mechanisms of nitrogen-bearing organic matter in lunar regolith remained poorly constrained until this study.

By selecting and analyzing soil grains from the recent Chang’e missions, the international team was able to systematically identify the nitrogen-bearing species. This allows researchers to better understand the evolutionary history of organic matter in the solar system and the transport mechanisms of organics from small bodies.

The study provides a clearer picture of how these exogenous materials, which may have supplied chemical ingredients necessary for the origin and early evolution of life on Earth, behave when deposited on a planetary surface without an atmosphere.

Scientific Implications

The identification of these organic species offers critical data on the chemical evolution of the solar system. The findings suggest that the lunar surface preserves a record of the interaction between exogenous organic matter and the harsh environment of space, including solar radiation and micrometeorite impacts.

• Identification of multiple nitrogen-bearing organic species on lunar soil grain surfaces.
• Confirmation of the Moon’s ability to preserve exogenous organic materials that are erased on Earth.
• Evidence of the modification of organic matter via irradiation and impacts on an airless body.
• Insights into the delivery of bioessential elements like carbon, nitrogen, oxygen, phosphorus, and sulfur to terrestrial planets.

This joint research effort underscores the value of the samples returned by the Chang’e missions in filling gaps in the understanding of small-body evolution and the early transport of organic matter across the solar system.