What are meteorite comets in the history of human destiny?

If you think too much, nuclear weapons will not be eliminated, and even if they are eliminated, they will be eliminated on the surface. The influence of the so-called "Peace People" is not enough to dominate the world, right? First, the purpose of the heads of state in building nuclear weapons is not to blow up a place, but to serve as a strategic deterrent to certain ambitious countries, so the possibility of eliminating nuclear weapons is almost zero.

The alien invasion you are talking about is unlikely, because the closest planet suitable for life that human beings have discovered to the earth will take at least light years to arrive, regardless of whether there is a higher civilization, even if there is a high civilization, it is impossible to come, and it is an impossible task to create a light-speed spaceship, and the materials, technology and energy required are unimaginable, of course, in the face of the vast and mysterious universe, it is not excluded that some creatures can reach the earth, but this is not necessarily malicious. As for meteorites, asteroids, comets and other stars hitting the earth, then there are only three situations: first, the stars are shattered by humans and cannot form a devastating blow to the earth; second, although the star was successfully intercepted, it was too large to be completely intercepted, causing a huge ** to mankind; Third, the astral body is so huge that humans cannot intercept it, and eventually humanity will be destroyed! (As mentioned earlier, the planet suitable for life is light years away from the nearest planet, so you don't have to think about it with the scientific level of human beings, so please cherish the earth, the only home of human beings).

Meteorite comets have had a certain impact in history. For example, in 1811, a year before Napoleon's invasion, a large comet appeared, which was visible for more than 200 days, and some people believe that it was a precursor to Napoleon's defeat. aqui te amo。

In 1847, a meteorite struck a ship bound for Italy from Japan, killing two sailors. In 1512, Fengcheng, Shandong Province, China, burned down more than 1,000 houses due to a meteorite. The following year, Fengcheng was homeless due to a meteorite**.

On November 30, 1954, in a small town in Alabama, USA, a 3,900-gram meteorite fragment broke through the roof and ceiling, injuring a sleeping woman. However, it is extremely rare for a meteorite to fall and directly injure people.

Meteorites have also been seen falling to rooftops. In the last 20 years or so, only seven of the newly fallen meteorite events discovered in the United States and Canada have caused serious damage to homes, usually on the roofs of buildings and garages. In the other two incidents, the roof was not damaged due to the low mass of the meteorite.

There was also a meteorite weighing 1,300 grams that hit a mailbox, causing it to be badly deformed. If we take into account that a part of meteorites fall to the roofs of public facilities and industrial plants unnoticed, then the probability is an average of 16 falls to the roof per year or 20 years. All of this is observed and confirmed. Meteorite.

Comet: This requires a talk about the origin of the solar system. The accepted theory about the origin of the solar system is the nebula hypothesis proposed by Kant and Laplace, which holds that the solar system was created about 5 billion years ago from the accumulation of material in a primordial nebula.

After the formation of the solar system, far from the sun, there are still some remnants of the material in the primordial nebula. Slightly closer is a ring belt, called the Kuiper belt, and a little farther away is a material spherical layer, called the Oort focal-type ascending clouds. The material here is subject to a relatively small gravitational attraction of the old sun, and the orbit is unstable, and the slightest gravitational disturbance will change the orbit and fly to the inner side of the solar system, and when it orbits near the massive planets such as Jupiter and Saturn, it will be disturbed by gravity again and form new comets.

It is generally believed that periodic comets come from the Kuiper belt, and non-periodic comets come from the Oort cloud (the first floor quotes my previous one, haha).

Meteorites: Earth often encounters small alien bodies. When these small bodies enter the Earth's atmosphere, they rub violently against the Earth's atmosphere and burn up.

This is a shooting star. If a meteor falls to the ground before it has burned up, it is a meteorite. Meteorites are divided into three types: stony meteorites, iron meteorites, and stony-iron meteorites according to their main chemical compositions.

Their radius and mass are very different from each other and cannot be generalized. If the small object that hits the Earth is more than 10 kilometers in diameter, it will cause the same damage as the dinosaurs did.

The Moon and the Earth have different oxygen isotope slopes, and the Martian ones are also different, and when Viking crossed the atmosphere of Mars, the atmospheric composition of Mars was obtained, and at the same time, the same composition was also detected in the inclusions of Martian meteorites. Meteorites of the HED group are mostly through the spectrum.

Tell if it's a meteorite. First. Airmark, too.

It's the big and small pits on its surface. Second within. The flow pattern, that is, the traces of the flow that it allows through the atmosphere to burn violently.

Third. Magnetism, i.e. a magnet can attract it. Fourth.

The molten shell is a thin layer produced by melting and cooling on its surface. Fifth. Pickling, generally iron meteorite slice pickling, will clear the beautiful Vesteden pattern.

However, the above are only a few ways to identify meteorites, and they should not be stuck to this, they must be dogmatic. I believe that as long as it has been baptized by the atmosphere, a meteor that burns violently and falls to the ground is a meteorite, no matter what it contains. As for which planet the meteorite came from, scientists are **, there is no unanimous opinion.

The arrival of meteorites provides valuable scientific research specimens for human beings to study the universe, parallel universes, extraterrestrial galaxies, galaxies, solar systems, black holes, wormholes, dark matter, dark energy, antimatter and space-time tunnels, most of the meteorites come from 4.6 billion years ago, and their scientific research value and historical value are immeasurable, and their collection prospects are bright. The meteorites collected by netizens, as long as they are true, then every meteorite is brilliant! Thank you, netizens!

a.Meteorite.

On BaiTalk about it, talk about it. Most of the meteorites on the earth come from the moon, and the meteorite descent process produces a high temperature of more than 3,000 degrees to the atmospheric right layer**, and the meteorite has three grades of iron meteorites.

II. Glass meteorite. "Stone Iron Meteorite" is difficult to find on the earth, meteorites fall from the outer sky and really fall into the ground or fall into the river, judging that there are several points in the meteorite. Iron meteorites never rust in the water, there are burned gas marks on the surface of iron meteorites, and the weight of meteorites is several times higher than that of earth rocks.

End of this article.

The people I signed the meteorite museum didn't know that it was from that planet, just knowing that black was a meteorite, and other colors were ordinary stones, and they didn't know about meteorites, and they came out to sign meteorites just to make money.

The average density of BAI in meteorites is 3, and the main component is DU

To identify whether a sample is a meteorite, the following aspects can be considered:

1. Molten crust: The meteorite has to pass through the dense atmosphere before falling to the ground, and the meteorite rubs with the atmosphere during the landing process to produce high temperatures, causing the surface to melt and form a thin layer of molten crust. As a result, the surface of the newly landed meteorite has a black molten crust with a thickness of about 1 mm.

2 Surface Air Marks: In addition, due to the interaction between meteorites and large air currents, there are many air marks left on the surface of meteorites, like finger prints.

3 Internal metals: Iron meteorites and stony-iron meteorites are internally composed of metallic iron, which has a high nickel content (5-10%). Chondrites also have metal particles inside, and fine metal particles can be seen on fresh fracture surfaces.

4. Magnetism: Because most meteorites contain iron, 95% of meteorites can be attracted by magnets.

5 Chondrites: Most meteorites are chondrites (90% of the total), and these meteorites contain a large number of millimeter-sized silicate spheres called chondrites. Round chondrites can be seen on the fresh fracture surface of chondrites.

Who has the Hunan Zhongli Meteorite Identification Center identified the meteorite map to see what kind of map?