Why do meteorites hit the Earth? Why is the meteorite hitting the earth so powerful?

Is it possible for a meteorite to hit Earth?

A meteorite is the solid material left over after an alien object has passed through the atmosphere, and its impact on the Earth is related to two factors: the mass of the meteorite and its velocity.

The mass of a meteorite can be small or large. The micrometeorite has been sufficiently decelerated in the atmosphere before hitting the ground, and the energy released during the impact is insignificant; Large meteorites cannot be greatly slowed down during the passage through the atmosphere, and most of the kinetic energy carried by them will be released at the moment of impact, so they are very powerful.

The relative velocity of a meteorite to the Earth is generally between a few km s and 70 km s. Since the kinetic energy formula e=1 2mv, when an object with a mass of 1kg reaches a speed of 70km s, it will carry 2450 megajoules, which is equivalent to 200 times the muzzle kinetic energy of a modern main battle tank, or the ** power of more than half a ton of TNT. A mass of 1 ton corresponds to a TNT yield of more than 500 tons, and a mass of 20 tons has the power of a typical nuclear warhead.

It brings a lot of dust, blocks the sun's rays, and kills a large number of creatures.

1. Meteorites hitting the earth will produce a large amount of dust, and a large number of organisms will die during the impact.

2. Cause a large amount of dust to completely cover the earth; Changes in the earth's crust, causing tsunamis, **, storms, etc.; The polar ice melted, the sea level rose dramatically, and much of the land was submerged; The heat of the volcano causes the earth's temperature to rise sharply, and if it cannot be dissipated, the temperature can eventually reach 25,000 degrees Celsius; Animals and plants die.

At that time, the crater caused by the Tunguska Great** was already relatively large, about 90,200 meters in diameter, and it was inferred that the energy released by the asteroid was equivalent to 10 million tons of TNT explosives**. The energy released by the Ylang crater discovered now far exceeds that of the Tunguska Grand**, and the energy released should be about 100 million tons of TNT explosive**, which is equivalent to the energy of 6,600 Hiroshima atomic bombs.

The Earth is not immediately destroyed after being hit by a meteorite, due to a combination of factors.

First of all, the mass of the Earth is very large, and its gravity can attract and swallow some smaller meteorites. As these smaller meteorites enter the Earth's atmosphere, they are heated and burned by air resistance, and only a small fraction of them eventually fall to the Earth's surface. And for larger meteorites, due to their greater mass, they generate very strong heat and pressure when they enter the Earth's atmosphere, causing them to burn or ** in the atmosphere, so that only a small part of the debris falls to the Earth's surface.

Secondly, the Earth's atmosphere can also play a protective role. When meteorites enter the Earth's atmosphere, they are slowed down and heated due to air resistance, resulting in high temperatures and pressures, resulting in evaporation and burning of materials on the surface. These effects of high temperature and pressure can disperse the impact energy of meteorites and prevent them from hitting the surface directly, thus protecting life and materials on the Earth's surface.

In addition, the earth's crust can also play a certain role in protection. When large meteorites hit the Earth, the shock waves and energy they produce are diffused and dispersed in the Earth's crust, reducing the direct damage to the Earth. The Earth's crust is also constantly undergoing plate movements and tectonic changes, so that the effects of meteorite impacts can be gradually dissipated and balanced.

In summary, the reason why the earth can withstand meteorite impacts is mainly due to its large mass, strong gravitational attraction and atmospheric protection, and at the same time, the movement and changes of the earth's crust can gradually dissipate and balance the effects caused by meteorite impacts.

If the Earth is struck by a large enough meteorite or comet, it can cause serious damage, but it will not immediately destroy the entire Earth. This is because the volume of the Earth is very large, and the volume of meteorites or comets is relatively small, and even very large meteorites or comets can only destroy part of the Earth. In addition, the Earth's atmospheric layer can also play a protective role in reducing the impact of meteorites or comets on the Earth.

How harmful is a meteorite hitting Earth?

The moment it falls to Earth, the stone meteorite will burn into a shell, and it will become a protection that will not shatter.

After the meteorite enters the atmosphere, the speed is getting faster and faster, the higher the compressed air, the higher the high temperature and high pressure, the violent friction and combustion makes the boron inside the meteorite rise ** and hit the ground at about 30 degrees to 70 degrees.

Let's think about an extraterritorial asteroid coming into Earth's orbit. Due to the gravitational force of the earth entering the atmosphere, it has been flying towards the earth at a speed of Mach 50-60 in an instant. At the same time, it also produces a violent friction with the atmosphere, which makes the surface of the asteroid produce super high temperature and aerodynamic high pressure to burn.

Causes molten (minerals such as iron, nickel, metal, quartz, etc.) on the surface of the asteroid.

Due to the force of thermal expansion and contraction, the surface of the asteroid continues to burst, and it burns up and vaporizes before it reaches the ground. And some slightly larger planetary objects are at a distance of 100 kilometers or tens of kilometers from the ground**. The force throws these molten minerals in all directions.

Due to the fact that the speed of descent is instantly changed by the ** force, <>

Due to the force of thermal expansion and contraction, the surface of the asteroid continues to burst, and it burns up and vaporizes before it reaches the ground. And some slightly larger planetary objects are at a distance of 100 kilometers or tens of kilometers from the ground**. The force throws these molten minerals in all directions.

As the speed of descent is instantly changed by the ** force, these molten substances slowly cool down in a state of loss of high temperature and pressure. And all kinds of solid forms have fallen to the ground (e.g., cone-shaped, drop-shaped, button-shaped, but also oriented, etc.), what if the larger asteroid objects?

Needless to say, everyone knows that it will be a disaster for the planet, and hopefully it will never happen.

First of all, when the meteorite falls to the earth, it burns at high temperature through high-speed friction in the atmosphere, and decomposes countless small meteorites and falls to the earth. So the Earth sees the result of the decomposition of many small and intact meteorite blocks.

Meteorites only produce friction at a high speed and the temperature is 3000 like a coal, hitting the ground like a coal, and falling in a place with water will produce honeycomb strong, and the density and hardness of a meteorite after burning are larger. Second, the object that you hit when you fall to the earth is not very hard, and if you hit a harder object, it will also break, and I have also picked up broken meteorites, but the number is very small.

It may have been a crash on a relatively soft grass, or a fall into the ocean, without a very violent collision.

Because of the gravitational force and magnetic field on the earth, they did not shatter when they impacted, and meteorites actually have a lot of energy.

Because the meteorite is subjected to the friction of the atmosphere during the landing, the loose places are burned, leaving behind the hardest parts, so they did not break when they collided with the earth.