Astronomers discovered unusual materials that could have been brought to the landing site of the module from a huge distance of up to 1300 kilometers.
Chinese astronomers presented the first report on the study of lunar soil samples, which were delivered to Earth in December 2020 as part of the Chang’e-5 mission.
According to the recent data, approximately 10 percent of the lunar samples have a chemical composition that is not characteristic of the place where they were taken.
Chang’e 5’s Exotic Lunar Samples: Everything you need to know
The Chang’e 5 mission started on November 23, 2020. One of the tasks was the delivery of lunar soil to Earth, by the way, the first since 1976. A module separated from the orbiter and landed in the Ocean of Storms near Rumker Peak.
Two kilograms of lunar samples
It collected almost two kilograms of lunar rock samples, which were successfully delivered to Earth on December 16, 2020. As it turned out, among them were fragments of the youngest lunar soil that has ever been delivered to Earth for research in a laboratory.
Yuqi Qian of China Geological University and his team performed preliminary analyzes of rock fragments and lunar dust. This was the so-called geological mapping, designed to separate “local” rocks from “exotic”. Such a process is intended to help to identify the features of the landing area of the descent module.
One of the youngest geologic regions
The study found that the landing site is one of the youngest geologic regions of the Moon, about two billion years old. The lunar samples delivered to Earth, in turn, represent a rather loose soil formed over two billion years as a result of fragmentation and crushing of rocks under the influence of meteorite and asteroid impacts.
According to the report, 90 percent of the material collected by the Chang’e 5 module is likely local. Scientists believe that they were formed directly in the area of the module landing and its immediate vicinity. This type of regolith is known as marine basalts, a volcanic rock that covers most of the near side of the Moon. It is clearly visible to observers in the form of dark gray areas.
The remaining 10 percent of the fragments studied were found to be “foreign”. According to the researchers, these samples have a completely different, “exotic” chemical composition compared to marine basalts. This is probably due to the fact that these fragments were brought to the landing site of the module from other areas, including very remote ones. This is possible in the case of collisions of cosmic bodies with the lunar surface.
Fragments of meteorites and asteroids
As recent studies have shown, the Moon at an early stage of its development was subjected to massive space “bombing”. Considering this, experts suggested that some of the “alien” material in 10 percent of the samples studied could be fragments of meteorites or small asteroids that hit the lunar surface in antiquity.
In addition, Chinese scientists, in collaboration with colleagues from the Universities of Brown and Münster, studied granular inclusions in soil samples created from rapidly cooled vitreous material. Analysis has shown that these “glass balls” are identical in composition to materials from the now extinct volcanic vents known as Sharpe and Meran.
These impact craters are located 160 kilometers northeast and 230 kilometers southeast, respectively, of the probe landing site. In fact, the fragments delivered to Earth provide new insight into the very violent volcanic activity on the Moon in the distant past.
By the way, the report suggests that some “alien” materials could have been brought to the landing site of the module from a huge distance of up to 1300 kilometers, which indicates powerful processes that literally once shook the surface of the Moon.
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• Phys.org. (2021, September 24). Exotic mix in China’s delivery of moon rocks.
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• Torbet, G. (2021, September 25). China’s lunar sample Contains glassy BEADS, Impact Fragments. Digital Trends.