Jilin meteorite guide words

Let's be good. Next, we will go to the Meteorite Museum in Jilin City, where we will go to see a mysterious brother from a distant alien-Jilin Meteorite.

Jilin meteorite is an international tourism resource in Jiangcheng, and it is called "international emissary, whispering". 1976 crashed into Jilin city on March 8, 1976, and the fall of this meteorite was equivalent to an earthquake of magnitude 1.7.

On that day, many people witnessed the fall of meteorites. According to their memories, the worst place is a red fireball in the northeast of the sky, which is radiant and dazzling, and the full moon is even bigger. There was a beam of light behind the fireball, mixed with thick smoke.

During the long journey, the fireball was repeatedly exploded due to infinite temperature and external force. When the main meteorite exploded over Zhu Jin Township, Longtan District, Jilin City, a yellow fireball suddenly announced strong light, and then three small fireballs rushed out and flew southwest with light beams, which were the three largest meteorites in Jilin. Now it is named as Jilin No.1, No.2 and No.3 meteorite. Jilin meteorite fell in the plain area of nearly 500 square kilometers near Fiona Fang and Yongji County in Jilin City.

The meteorite Jilin 1 landed in the community of Huapichang Town 10, Yongji County, Jilin City. On March 8, in the north, the climate has just warmed up. 1 meteorite penetrated 1.7 meters of frozen soil and plunged into the ground 6.5 meters. The diameter of the crater is 2.65,438+0 meters. Kang Yongchun, the witness closest to the scene at that time, recalled that when the Jilin No.1 meteorite landed, it was seen from a distance. Splashed clods can reach as far as150m.

As soon as meteorite shower in Jilin Province fell, the Chinese Academy of Sciences in Jilin Province organized a "meteorite shower Investigation Team" to investigate. At that time, * * * collected 138 large meteorites with a total weight of 26 16kg, which have been collected and exhibited by Jilin Provincial Museum. The meteorite taken from the No.1 pit has a gross weight of 1.775kg and a volume of 65438.

Meteorites bring abundant information about the composition and evolution of celestial bodies in the solar system, and their experimental analysis will help to clarify the mystery of the evolution of the solar system.

The solar system is a celestial system composed of stars, the sun, planets, comets, meteoroids and interstellar matter. The planets that make up the solar system are nine planets such as Mercury, Venus, Earth, Mars, Uranus, Neptune and Pluto, and a large number of asteroids. Most asteroids will gather between the trajectories of Mars and Jupiter, and there will often be some asteroids with special trajectories that violate the trajectory.

Because of these asteroids with special trajectories, there have been some collisions between planets in the world. Brothers who like astronomy must know that every year, in the middle of 1 1 month, according to the law of the earth's operation, the earth passes through the trajectory of Comet Temple, and tiny dust particles are scattered on the trajectory by the comet's tail, just colliding with the earth head-on. At the same time, we can see very spectacular meteors or meteor showers on earth.

It is because of this collision between stars that the Jilin meteorite fell to the earth. According to astronomers' calculations, the "International Messenger, whisperd" Jilin meteorite was originally a part of an asteroid with a diameter of about 440 kilometers, which was formed 4.7 billion years ago. Its trajectory between Mars and Jupiter collapsed in a violent celestial collision about 8 million years ago, and the mother of Jilin meteorite was born. After the birth of the first collision, the Jilin meteorite formed an elliptical space trajectory (perihelion is about one hundred and fifty million kilometers), entered the earth orbit (apohelion is about 420 million kilometers), and was located at the edge of the asteroid belt, forming two intersections with the earth orbit, so collision with the earth was inevitable.

1On the afternoon of March 8, 976, the meteorite from Jilin overtook the earth from the back of the earth at a relative speed of 15- 18km/s and passed through the atmosphere at a very high speed, so the meteorite fell at 15: 02: 36.

Before the fall of Jilin meteorite, the Norton meteorite 1948 discovered in the United States on February 28th was called the world's largest, weighing 1079 kg. However, after the fall of the meteorite in Jilin, it obviously acted as the number one figure in the world, so besides being the number one in the world in weight, it also invented another number one in the world, a miracle, which is the largest in the world at present. The scale of the rain area decline is very wide, scattered in the land with a total area of nearly 500 square kilometers, which is 72 kilometers long from east to west and 8.5 kilometers long from north to south. Jilin meteorites are rare in the world in terms of quantity, weight, scattered scale and scientific and technological content. When meteorite shower came, cries came from all over the mountains and hundreds of miles away, and the loud noise and shock waves of landing shattered the glass windows of many residents' homes. The situation is huge and powerful, just like a small atomic bomb, but surprisingly, there are no casualties.

At present, according to the gold content and the share of silicate rocks, scientists divide them into three categories, namely, stone meteorites, iron meteorites and iron meteorites. Jilin meteorite belongs to stony meteorite. According to scientific analysis, Jilin meteorite belongs to olivine, that is, bronze pyroxene chondrite, which is an extremely precious international sample. Thirteen kinds of amino acids and organic compounds were found in meteorites. More than 40 kinds of minerals and more than 30 kinds of minerals have been found in meteorites, some of which are found in similar meteorites for the first time. To help uncover the source of elements, it can be said that "the arrival of Jilin meteorite is equivalent to launching an earth satellite."

So what is the relationship between meteorites and humans? We all know that dinosaurs were a large reptile in ancient times. If they hadn't died out in the late Mesozoic, then at least the ancient apes in the uncivilized era had no chance to become today's people. So, how did dinosaurs become extinct? Scientists have discovered that. The third gap accumulation layer has a layer of white powder with a thickness of several tens of centimeters. Therefore, amino acids on the earth are extremely scarce, so they speculate that a meteorite with a diameter of about 10 km collided with the earth 65 million years ago, and the infinite blasting immediately killed most dinosaurs after the collision. After the explosion, powder covered the earth for several years. The sudden change of soil temperature caused no dinosaurs to survive, but the extinction of dinosaurs brought vitality to other reborn animals. For example, the appearance of mammals, apes have also been forced out of the forest. Meteorites contributed to the emergence of human beings. Due to the influence of meteorites, the occurrence and evolution of organisms have been promoted, but meteorites will also bring harm to the elimination of human beings.

Brothers, let's take a look. There is a dark shell on the surface of this meteorite, called molten shell, with a thickness of about 0.5-1mm. Scientifically, according to its composition and appearance characteristics, molten shell can be divided into primary molten shell and secondary molten shell. So, how is the molten shell formed? When a meteorite rushes into the atmosphere at the speed of 15- 18 km per second, the strong shock wave makes the air molecules rapidly differentiate, ionize and burn, and the temperature can reach 2000 &; . ordm。 C, this infinite heat energy is partially transferred to the meteorite body, making its surface temperature reach 3000-3500 &; . ordm。 C, direct evaporation of mineral resources on the surface. In the other part, a liquid layer is formed on the surface of the meteorite. When the meteorite falls to the low altitude, the speed and pressure drop sharply, which makes the silicic acid solution cool rapidly, thus forming glassy substances, microcrystals or microcrystals. It is in this physical and chemical process that the shell is formed. Other meteorites we saw were also covered with many gas marks of different shapes and sizes. This is due to the fierce collision, combustion and airflow impact between meteorites and air in the atmosphere.

Brothers, the museum we are visiting now is the only meteorite museum in China, which belongs to the natural category. In this museum, there are many materials, photos and meteorite specimens from other countries. We can take a closer look and take pictures here as a souvenir.