The Chinese probe Chang-e-4 could confirm the old theory of the emergence of a large crater on the dark side of the moon.
The place where the unmanned aircraft landed is within the immense depression created by the asteroid's influence several billion years ago.
Mission scientists now find evidence that this is the case the influence was so powerful that it had pierced the moon's barkwhich introduces into its lower layer of cloak.
Chang & # 39; e-4 has identified what they look like be rocks this one surface cloak, one of the questions asked by the investigation.
The findings are presented in the British magazine nature, Chunlai Li and other scientists from the Chinese Academy of Sciences in Beijing.
Survey of the surrounding area
The hidden side of the Moon (the one that can not be seen from Earth) that's more irregular to the side who we see in the sky and represents less "Mary" because they are known in the dark plains created by ancient volcanic eruptions.
The Chinese ship arrived there on January 3 and it became the first to perform landing on the moon successfully in the unknown lunar extremity.
Then the Yutu-2 lunar rover left the platform to explore the surrounding area.
Chang & # 39; e-4 landed within a 180-km-wide crater-shaped crater called the Von Kármán crater.
This small crater is located within the Aitken pool on the Lunar South (SPA, as is known in English), which is about 2,300 km long and covers nearly a quarter of the Moon's range.
The age of the Aitken pool is unknown, but it is believed to be at least 3.9 billion years old. Scientists believe that the asteroid that formed it around 170 km wide.
Yutu-2 is now identified rocks with a very different chemical composition to those found in other parts of the moon.
The first results of a visible and close infrared spectrometer (VNIS) on board show that the rocks contain minerals known as (ortho) pyrosten and olivin, with low calcium content.
They fit into the profile of the rocks of the lunar mantle and point out that the ancient blow created by the Aikinen pool crossed the jewel 50 km deep to the mantle.
The usefulness of results
Data obtained by observing the moon-ringing aircraft were not convincing in view of the presence of rock on the surface.
Scientists at the forefront of Chang & # 39; e-4 want continue with Look at those rocks and find others.
They also raised the possibility of launching another mission to send some of these rocks to the Earth to study them in the labs.
The results would help scientists Understand the chemical and mineralogical composition of the mantle, which could enlighten the origins and the Moon's evolution.
Team mission members are also trying to find out more about what happened after the asteroid collided with the Moon and formed the Aitken pool.
Scientists estimate that the holes on the surface could be filled with melted rock (in the interior formed of "molten"), which complicates the geological picture of this area.
Patrick Pinet, from the IRAP research institute in Toulouse, France, rated the results "exciting" and said they could "have significant implications for the characterization of the upper mantle composition".
"It is of the utmost importance to move to discover the geology of the lunar hidden face because expand our fundamental knowledge on creation of the moon and the origin of the asymmetry bark that exists between its close and distant sides, as well as that it can prepare future missions where samples are returned (to Earth), "he said.