Md Jahedul Islam

The remaining pieces of planets are asteroids. These asteroids are rotating in a certain orbit centered on the sun. Some of them sometimes turn around in the orbit of the earth and collide with the earth. Asteroids are part of the solar system, small planets, rocky objects that are usually located between Mars and Jupiter. There are about thirteen lakh asteroids. This region between Mars and Jupiter is called the asteroid sphere. This sphere contains many smaller stones and metals than the planet. These stones are called asteroids or small planets. They are not visible from the earth to the empty eye, but many can be seen through telescopes or small telescopes (telescopes).

There are probably a few million asteroids in the solar system. More than 96,000 ( ninety six thousand) asteroids have been identified with numbers. About 12,000 ( twelve thousand) of them are named. In the first 10 crores years of the solar system, asteroids have lost 99.99% of its mass. Numerous asteroids are constantly hitting the earth. For this reason there are hundreds of tons of dust thrown from the atmosphere space to the earth. Sometimes a small size (for example a car -shaped) asteroid can enter our atmosphere. But the mesosphere comes to the level. Never reach the surface of the earth. Meanwhile the hope is that most asteroids are very small in size.

The number of asteroids is sufficiently harmful to the earth. However it is low. So it is less likely to hit the world. But it is not impossible to hit the asteroid on earth. Some asteroids are less than one kilometer in length and width. The limit of the asteroid up to 50 meters has been formally fixed. As a result of the progress of the telescope and especially in the case of objects around the earth. Something smaller than 50 meters is occasionally seen passing near the earth. However an asteroid of 10-12 km was responsible for extinction of the dinosaurs. It was a different thing for the world. But if an asteroid near about 10-12 km will fall into the earth then it will be a dengue rigours for the future world. The number of such asteroids is very low and it may be on the earth once a few million years. Meanwhile there is an atmosphere to protect the earth from the asteroid. In addition, there are many other satellites, including NASA, to monitor all space rocks around the earth. However it is very difficult to identify asteroids on the earth without the special observation and motion goals of the asteroid. In addition, according to the BBC data, in 2021, NASA sent a vehicle called Dart to space. Which is originally made to remove an asteroid from the earth from its path. Asteroids are usually irregular in size. However some are almost round asteroids. There is no atmosphere in the asteroid. They are structurally three (03) classes. For example the first one is C-Type: (Chondrite).

They are most commonly seen. This C-type: (chondrite) asteroid is usually made of mud and silicate rock. They are mainly one of the original objects of the solar system. The second is S-Type. This S-Type type asteroid is made up of silicate and nickel-ion. The third and last M-Type is made up of metal asteroids and nickel-ion. There are different sizes of planets, such as only 10 meters in radius and large planets, such as Vesta, which is about 530 km. Contemporary of the solar system approximately 460 core years of age. However the asteroids are dangerous to the Earth. Because then about 460 (four hundred sixty) crores years ago an asteroid of 10 to 15 km of radius hit the earth. Which results in the dinosaurs gradually disappearing. Depending on the position of the planet those asteroids are divided into three parts. Among them are the main asteroid belt between Mars and Jupiter. It is estimated that 11 lakh to 19 lakh asteroids are scattered. Another Trojans is a special area.

The gravitational force of the planet on the orbit of each planet is equal to the gravitational force of the planet and the gravitational force of the sun. Which is why it is fairly stable in that part and that part is known as Lagranj Point. The last is the Near-Earth Asteroids near Earth that crosses the earth very close. NASA monitors this type of planet. Scientists have recently expressed concern over the move of an asteroid. According to information provided by astronomers an asteroid called '2024 YR4' is coming towards the earth. Scientists believe it may hit the earth in 2032. Concerns about this are increasing day by day. Recently NASA scientists increased the chances of asteroids to hit the earth increased from 1 percent to 2 percent. Scientists have said this after receiving new information about the asteroid.

The European Space Organization (ESA) recently confirmed this information. Scientists have decided to monitor the asteroid through the James Web Space Telescope to measure the speed and size of the asteroid. Scientists have decided to use the telescope to check the small risk of asteroid as well as whether any precautions are needed to keep the earth safe. For the first time on December 25 last year the '2024 YR4' asteroid was identified. Since then it is included in the risk list of asteroids that may be near the earth. According to recent data, the diameter of this asteroid can range from 40 to 90 meters. It may be the size of the asteroid hit in Russia in 2013. The asteroid exploded in the atmosphere and broke thousands of windows in the city of Cheliabinsk, and hundreds of people were hit slightly in the incident. This asteroid falls into an iceberg lake. There was only one (01) meter left after falling. However if the 90 meter asteroid is hit, its effect can be much higher. The Tunguska incident of Siberia of the year 1908 could have an impact. It crushed millions of trees and according to eyewitnesses and some people died. If such an injury is in a large city then its results can be like a great deal.

The writer is a, Network Technician (ICT Cell) Jagannath University, Dhaka.