The Beijing Planetarium received a meteorite specimen from Hami, Xinjiang

Yesterday, the Beijing Planetarium accepted a meteorite from Hami, Xinjiang. This is a stone meteorite discovered by local geologists and donated free of charge.

The donor was called Wang Jianming, a geologist and a member of the China Meteorite Network, the meteorite was the first to be discovered in Hami, according to geological work experience and meteorite enrichment, he judged that there had been a meteorite rain in the local area, and then it was detected by instruments as chondrites, so Mr. Wang Jianming entrusted the China Meteorite Network to donate the found meteorites to the Beijing Planetarium for scientific research.

It is reported that The Beijing Planetarium and the China Meteorite Network are assisting meteorite discoverers in applying for international nomenclature.

Yesterday, Mr. Wang Jianming, representative of China Meteorite Network, handed over to Dr. Zhu Jin, director of the Beijing Planetarium. "After our professional identification, this is an ordinary chondrite L5 meteorite." Meteorites are precious and rare physical specimens of human beings who directly know the stars of the solar system. Meteorites often carry mineral assemblages that are not or are not common on Earth, as well as traces of high-speed combustion through the atmosphere. The stone meteorite is composed of silicate minerals such as olivine, pyroxene and a small amount of plagioclase, and also contains a small amount of metallic iron particles, sometimes up to more than 20. Density 3 to 3.5. Stone meteorites account for 95% of the total meteorites. Chondrites are characterized by a large number of millimeter to submillimeter spheroids in size, which are the most primitive materials in the solar system, which are directly condensed from the primitive solar nebula, and their average chemical composition represents the chemical composition of the solar system, and this meteorite has a certain scientific research value.

 Formation of meteorite rain

Meteorite rain is a meteorite phenomenon. Larger meteorites fly during the fall process, and due to the impact of high-temperature and high-pressure air currents, explosive meteorites will crack in mid-air. If the meteorite parent body is large enough, the bursting fragments will scatter to the ground like raindrops, a phenomenon called "meteorite rain".

our country is the earliest country in the world to discover meteorites, as far back as the Neolithic Age, and then through the dynasties, until the end of the 20th century, there are written records, and there are many place names marked with "falling stars", such as "falling star mountain", "falling star lake" and so on. Meteorites are generally divided into three categories according to their composition, namely iron meteorites, also known as meteorites. Generally, the iron-nickel content is above 95, including 80 to 95 iron and 5 to 20 nickel. Density is 8 to 8.5. Other components can include sulfides, diamonds, rare earth elements and silicates. Iron meteorites account for about 3% of the total meteorites. The world's No. 3 iron meteorite was discovered in Qinghe County, Xinjiang, our country at the end of the 19th century, with a size of 2.42×1.85×1.37 and a weight of about 30 tons. The meteorite contains 88.67 iron and 9.27 nickel. It contains a variety of minerals that are not found on Earth, such as conelite, nickelite and other cosmic minerals. Stone - iron meteorites: composed of iron, nickel and silicate minerals, with iron-nickel metal content of 30 to 65, this type of meteorite accounts for about 1.2 of the total meteorites, so it has the highest commercial value. The meteor rushes into the atmosphere at a great speed, and due to the friction of the air, its surface temperature can reach 3,000 degrees, so that the surface of the meteor and its interior are uneven, coupled with the impact of the meteor on the air, the compression of the shock wave generated makes the meteor explode a big explosion at a certain altitude, and the entire meteorite bursts into many meteorites of different sizes. These meteorites fell like raindrops, forming the meteorite rain that people see.

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