Kowloon congratulated him and said that he would definitely visit again.

I really can't imagine that Mr. Wang's daughter-in-law has become a wife for many years, showing her love stone to tourists, sharing her experience of playing with stones, and increasing her income, what a perfect ending, Jiulong also secretly made up her mind in her heart, and she must go to the next level in the future.

Jiulong was pondering, and a strange phone call came: "Xiao Huang, aren't you interested in meteorites? How about it, do you want to come to Zhangzhou to see my stone museum, I recently found a big guy, and experts from the Chinese Academy of Sciences will come to identify it tomorrow." ”

It turned out that He Gang took the initiative to call, and he ran into walls everywhere in this section, and he was very depressed, maybe he went to find a meteorite, maybe it would be sent.

Jiulong was excited when he thought about it, and immediately set off and drove to Zhangzhou.

When Kowloon arrived, he saw He Gang accompanying two scholars around a boulder, pointing and pointing.

This boulder is like a natural tea table, the middle is convex, it is half-moon shaped, and the whole is rusty, which is very eye-catching.

When He Gang saw Jiulong, he hurriedly called Jiulong to come over and told Jiulong that one scholar was Zhang Baogaogong, a meteorite expert from the Beijing Planetarium of the Chinese Academy of Sciences, and Master Zheng Rong, the inheritor of the Longquan Treasure Sword Meteorite Iron Sword, who had made a special trip here for a field investigation.

He Gang introduced to Kowloon the general situation of this large-scale single one-ton heavy iron meteorite and other meteorite collections, saying that it is rare for his meteorites of more than one ton to be collected in private collections at home and abroad.

The two experts also nodded their heads again and again, saying that this meteorite is a treasure.

Since there are experts present, Kowloon will not let go of the opportunity to learn, he asked Zhang Bao senior engineer, what is the trick to judge whether it is a meteorite?

Zhang Gaogong replied: "You must first understand what meteorites are made of, and then it is much easier to judge the authenticity of the meteorite." ”

"Yes? Can Zhang Gaogong talk about it in detail? ”

Kowloon is like a schoolboy who is full of studiousness.

"Well, you listen up. ”

Zhang Gaogong and He Gang walked to the tea area together, sat down and drank a few sips of oolong tea, and then began to introduce the causes and consequences of the meteorite.

Because meteorites come from outer space, the determination of the authenticity of meteorites requires instrument identification, and the naked eye only has an auxiliary role.

Most meteorites come from the asteroid belt between Mars and Jupiter, and a small number from the Moon and Mars.

Meteorites can be roughly divided into stony meteorites, iron meteorites, and mixed meteorites of stone and iron.

The average density of meteorites is between 3~3.5, and the main component is silicate.

Meteorite has a density of 7.5~8.0 and is mainly composed of iron and nickel.

The composition of meteorite is between the two, and the density is between 5.5~6.0.

Meteorite refers to the remnants of meteorites that fall to the ground, which are composed of minerals such as iron, nickel, and silicate, and are also known as meteorite stones.

It also refers to meteorites that contain more or all of the stony material.

A large amount of organic matter such as ammonia, nucleic acids, fatty acids, pigments, and 11 kinds of amino acids have also been found in meteorites with high carbon content, so it is believed that the origin of life on Earth has a considerable relationship with meteorites.

In observation, it was found that there is an asteroid belt between the orbits of the planets of the solar system, Mars and Jupiter, which is the home of meteorites.

When a meteor enters the atmosphere, it explodes due to high temperature, high pressure and internal imbalance, forming a meteorite shower.

When the unburned falls to the earth, it becomes a meteorite.

A crater with a depth of 170 meters and a diameter of 1,240 meters has been discovered in Arizona, USA.

There are also large craters in Antarctica, up to 300 kilometers in diameter.

In the middle of the Atlantic Ocean, a giant crater with a diameter of more than 1,000 kilometers has been discovered.

Our planet receives 50,000 tons of such a "gift" every day.

Most of them burn up at an altitude of 10 to 40 miles above the ground, and even if they fall to the ground, they are difficult to find.

They operate in the universe, and because they have no other protection, they are directly exposed to radiation and catastrophe by various cosmic rays, and their own radioactive heating cannot make them change greatly. So the record of its own is reliable.

The scope of its research is quite broad, such as high-energy physics, astronomical evolution, geochemistry, and the origin of life.

In addition, there is another type of meteorite called "glass meteorite".

It's black or dark green, a bit like a stone, but it's not a stone, it's a bit like glass, but it's a very special glass-like substance that doesn't crystalline.

It comes in a variety of shapes, is generally not large, and weighs from a few grams to dozens of grams.

The identification of glass meteorites mainly depends on the place where the sample was found and its chemical isotope characteristics, and the chemical isotope characteristics are used as the final basis.

So far, hundreds of thousands of suspected glass meteorites have been discovered, and it is strange that their distribution is clearly regional, and the cause of their regional occurrence has not yet been determined.

Meteorites burn and abrasive in the atmosphere, and their forms are round and angular.

"Zhang Gaogong, is there an easy way to judge whether it is a meteorite? ”

Kowloon interjected.

"Yes, it can be judged from the following aspects. ”

Zhang Gaogong patiently explained.

Molten pits.

The surface of meteorites is covered with pits of different sizes and depths, that is, melting craters, and many meteorites also have shallow and long gas marks, which may be left by the shedding of minerals with low melting points.

Molten shells.

When a meteorite passes through the atmosphere, the extremely high temperature causes the surface of the meteorite to melt, creating a vitreous layer in the micron to millimeter range, which is called the molten crust.

When a meteorite exists on the surface for a long time, its molten shell is easily weathered and disappears.

Specific gravity.

Meteorites contain more iron-nickel specific gravity, iron meteorites can reach 8 specific gravity, and stony meteorites often contain 20 iron-nickel, which is larger than the general rock specific gravity. However, there are a very small number of stony meteorites (such as carbonaceous chondrites) that contain no or very low metal content, and their density is similar to that of ordinary earth rocks.

Magnetism.

Various meteorites are magnetic of varying intensity due to their iron content.

Weathered meteorites are not magnetic, so they are not considered meteorites.

Streak.

Meteorites rubbed against unglazed porcelain plates generally have no streaks or only light gray streaks, while iron ore streaks are black or brownish-red, so that they can be distinguished.

The above can basically determine whether it is a meteorite or not.

"How do meteorites come to be?"

Kowloon asked further.

"This is the evolution of the movement of a small celestial body. ”

Zhang Gaogong introduced.

Through the observation of some meteorites embedded with gravel, we understand that the space environment when small celestial bodies evolve in space is that there are a large number of small celestial bodies orbiting the sun, and the diameter of these small celestial bodies is as large as tens of kilometers, hundreds of kilometers, as small as tens of centimeters, several centimeters, and even smaller than the size of pebbles and sand and dust particles.

Small celestial bodies often collide with each other during their orbit, and generally speaking, small celestial bodies with a scale of more than 10 centimeters are hit by thousands, tens of thousands of gravel or dust particles.

Since these small celestial bodies are moving in space at cosmic speed, they are much faster than the travel speed of guns and shells.

Therefore, the impact force generated by the collision between small celestial bodies against each other is very large.

Under the action of this impact force, high temperature and high pressure will be generated on the impact surface between small celestial bodies, and the mineral rock will be melted and metamorphosed to form a molten body.