Seven tiny grains from China’s Chang’e-6 Moon mission have uncovered traces of a rare type of meteorite called CI chondrite. This is the first time such meteorites have been confirmed on the Moon.
CI chondrites are unique because they are soft, water-rich stones that contain elements that can easily evaporate. Their existence in lunar soil hints that ancient water-rich asteroids may have bombarded the Earth-Moon system more frequently than previously thought.
The Chang’e-6 mission brought back just over 4 pounds of lunar soil and rock from the Moon’s far side, specifically from the Apollo Basin, a region that may hold some of the oldest rocks on the Moon. Jintuan Wang, a geochemist at the Chinese Academy of Sciences, leads the research into how meteorites transfer materials, including water, from asteroids to planets.
Unlike Earth, the Moon has no atmosphere. When meteorites hit the Moon, they do so with incredible speed. Given their fragility, CI chondrites usually disintegrate or vaporize upon impact. Therefore, finding any remnants of these meteorites is greatly significant.
Limited CI chondrite samples have been retrieved on Earth, making these new discoveries particularly valuable. Similar samples returned from asteroids like Ryugu and Bennu reinforce the idea that some of these bodies are quite similar to CI chondrites.
The CI chondrite fragments discovered in the lunar soil provide a snapshot of the early Solar System. These materials preserved the chemical mix from a time when the planets were forming. The team discovered seven clasts with a chemical makeup similar to CI meteorites, showcasing a unique crystalline texture created by rapid cooling after impact.
Scientists believe that water-rich asteroids, likely including CI-like ones, contributed most of the Moon’s water. According to Wang’s team, about 30% of the meteoritic material on the Moon may have had a CI-like origin, suggesting that many objects striking the Earth-Moon system could have carried vital water and carbon-rich materials.
This discovery not only sheds light on the Moon’s history but also offers insights for upcoming lunar missions. Future explorations may reveal how common CI chondrite materials were throughout the inner Solar System.
The implications of these findings extend beyond the Moon. They suggest a connection between celestial impacts and Earth’s own development, particularly in terms of water and organic material.
Understanding the history of CI chondrites can also enhance our knowledge of the broader evolution of our Solar System, including the origins of life’s essential ingredients on Earth.
For further reading on the Chang’e-6 mission, check out resources from the Chinese Academy of Sciences.
Source link
Science
