Can it prevent meteorites from hitting the earth, and how big a meteorite can destroy the earth?

There is no way to do it, just a vision.

An asteroid with a diameter of about 10 kilometers could destroy the Earth. Not outright destruction, thoughScientists estimate that the collision of asteroids will not be enough to wipe out life on Earth, but the chain of events caused by the collision, such as massive volcanic eruptions, rising water levels, reduced oxygen levels in seawater, and rapid climate change, are the direct cause of the death of a large number of organisms.

The force of ** is equivalent to the 12th magnitude of the Richter earthquake, which is a million times the most intense ** on the earth, and the dust and carbon dioxide ejected by the volcano will produce a greenhouse effect, causing the earth's temperature to rise, dust and blocking sunlight, so that plants can not produce photosynthesis, and destroy the earth's food chain.

Famous meteorites:

1. The oldest meteorite.

The oldest meteorite, the Swedish muonionalusta iron meteorite, fell on the earth 1 million years ago, because of its proximity to the Arctic Circle, it has experienced 4 glacial ages, and the slices are beautifully crisscrossed by the Vickers Titan structure.

2. Jilin meteorite.

This is how the meteorite rain that fell on the land within a radius of 500 miles from Huadian, Jilin Province. Among them, the "No. 1 meteorite" fell near the birch bark factory in Yongji County, escaped more than 6 meters underground, and a mushroom cloud rose, and the vibration it produced was equivalent to the level **, and the furniture in the nearby room was overturned, and the cups and bowls were broken.

3. Tunguska meteorite.

What's more, it was a meteorite in the sky over the Tunguska region of Siberia, which not only shattered the glass of residential buildings a hundred miles away, but also turned the forest within a radius of 30 miles into ashes.

Directly below it, several "charcoal trees" actually stood upright, because the high pressure generated at the time made them strong. At the time of that meteorite**, even Moscow in the evening was like daylight.

It's as big as the Earth. But the impact has to be strong.

A meteorite impact on Earth is a low-probability event that is almost impossible.

The chance of such an impact on the Earth is at most once every 1 million years. Meteorite impacts bring a lot of dust, blocking the sun's rays and killing a large number of organisms. If scientists' speculations are accurate, the impact of meteorites has brought about at least two dramatic changes to Earth:

The formation of the moon and the demise of the dinosaurs 65 million years ago. It is very likely that the crater left by the latter is what is now Caribbean Bay. The crater of the former may only be the current Pacific Ocean, because only the Pacific Ocean has such a large volume that a huge meteorite can be knocked out of the moon from the earth, which shows the horror of meteorite impact.

It won't be good. Meteorites hitting the Earth happen every day.

Scientists believe that a giant meteorite that fell to Earth about 66 million years ago caused the extinction of many plants and animals on Earth. The meteorite, estimated to be 10 kilometers in diameter, hit Earth in the late Cretaceous period, which led to the sudden demise of the dinosaurs, giant reptiles that gave way to small mammals in the following Tertiary after ruling the planet for millions of years.

The clay of that age around the world was unusually rich in iridium. This substance is rare on Earth, but it is abundant in meteorites, so the iridium in the clay is thought to have been released by this massive meteorite impact.

Giant meteorites can cause the extinction of species in many ways. If it falls into the ocean, it can cause a tsunami, huge tidal waves up to 100 meters high. Some studies have shown that the ocean alluvium is consistent with the passage of the waves at this time.

Impacts can also eject large amounts of material into the atmosphere. This blocks the sun's rays, hinders the growth of plants, and in turn affects the animals that depend on plants. Scientists know that there were 70 extinctions at that time.

At the junction of the Cretaceous and Tertiary periods, a large area of fossilized coal ash, mineral particles with strong impact characteristics, and small spheres of molten rock have also been found. Huge meteorites can create craters up to 40 kilometers deep, enough to penetrate the crustal layers of oceans or continents, causing massive volcanic eruptions.

Whether it is the Sudbury crater in Canada or the Fort Friedburg crater in South Africa, there is evidence that both have caused mountain eruptions. Large-scale volcanic activity can directly lead to the extinction of many species. Widespread volcanic eruptions increase dust in the atmosphere, first cooling the climate for a period of time, then gradually leading to a corresponding global destructive warming, and finally deadly acid rain.

What does meteorites have to do with humans? We all know that dinosaurs were a large reptile in ancient times, and if they did not become extinct at the end of the Mesozoic Era, then the ancient apes in the age of obscurantism would at least not have a chance to become the people they are now. So how did the dinosaurs come to extinction?

Scientists have found that in the Cretaceous-Third Boundary sedimentary layer there was a layer of white powder about tens of miles thick, which is an extremely rare amino acid on Earth. Therefore, they deduced: 65 million years ago, a meteorite with a diameter of about 10 kilometers collided with the earth, and the huge ** after the impact caused most of the dinosaurs to die immediately, and the powder after ** shrouded the earth, for several years, the soil temperature changed suddenly, so that none of the dinosaurs survived, and the extinction of the dinosaurs brought life to other new animals, such as the emergence of mammals, and the ancient apes were also forced out of the forest.

Meteorites contributed to the creation of human beings, and due to the influence of meteorites, the creation of living things. Evolution, development, but meteorites can also bring the danger of destroying humanity. For example, the ancient civilization continent of Daxizhou, which has submerged into the bottom of the Atlantic Ocean, is located on the edge of the giant crater in the Atlantic Ocean mentioned above, and the reason why the ancient Indians, who created the splendid Mayan culture, suddenly disappeared is also because meteorites often appear there there. 

How harmful is a meteorite hitting Earth?