The United States has always regarded itself as the "world policeman", with this identity, conflicts and wars around the world have the figure of the United States, some of which are even triggered by the United States itself, and the United States has also brought great benefits to itself by virtue of these wars, which makes the United States more like to be the "world policeman" and protect the security of the whole world. Many countries have sneered at and dismissed this practice of the United States, especially those countries that have been invaded by the United States, and have openly condemned the United States. For the identity of the "world policeman" of the United States, it has always been a self-styled role of the United States, and people in other countries can say that they do not agree with it at all. Recently, the identity of the "world policeman" seems to be really coming true.
According to reports, not long ago, the NATIONAL AERONAUT OF THE UNITED STATES revealed that it will use a special spacecraft to hit the asteroid at the end of the month, thereby changing the trajectory of the asteroid in space, and the purpose of this experiment is to verify the possibility of blocking those asteroids that may crash into the earth through spacecraft or interceptors, so that they deviate from the original orbit and rub shoulders with the earth.
The special spacecraft, called dart, arrived at the Vandenberg Space Force base last month. It is currently undergoing its load-bearing processing at Musk's Space Exploration Technologies Company. It is expected to be on board the Falcon 9 rocket next week, and the launch time has been determined, that is, on November 23, the East 4 space launcher at this base will be launched. The plan was supposed to begin in July this year, but the date was repeatedly delayed due to the re-outbreak of the epidemic in the United States and some technical problems.
This time, the impact is a "phosphorus-di-state" asteroid with a diameter of 525 feet, which was the closest thing to Earth in 2003, with a distance of 4.46 million miles, so it is not a threat to Earth at present, and when it is hit, its distance from Earth will be stretched to about 680 miles. It was also the first time the United States had demonstrated the technology, and it had long been considered the best solution to the asteroids that could threaten Earth. Its principle is to change the trajectory of the planet by artificial means, that is, to change its trajectory through impact, and the amplitude of this change will become larger and larger over time, and finally when it approaches the earth, it will pass by the side of the earth. However, it is worth noting that the force of the impact needs to be accurately calculated, otherwise the force is too large may cause the target to fragment, thus posing a greater threat.
Whether this test is feasible or not remains to be considered, because it will take a while to bring the spacecraft to the asteroid of "phosphorus di-state" through the spacecraft, and it will take several years for the space agency to come up with specific data after the test, and in this long process, there are likely to be some unexpected accidents.
The seemingly distant risk of planetary impacts on Earth has actually become increasingly imminent in recent years, with a 66-foot-diameter meteorite exploding over the Russian city of Chelyabinsk in 2013, shattering the windows below. In 1908, the Tunguska explosion occurred in Russia's Siberia region, where a planet with a diameter of 160-200 feet exploded, destroying 80 million trees. In addition, the threat brought by space junk is also increasing, due to the rapid development of space in recent years, countries have launched satellites and rockets into space, these satellites and rockets after the abandonment of the formation of space junk will slowly drift with gravity in space, and when captured by the gravity of the earth will quickly fall towards the earth, causing no less destructive than some missiles, so for this situation that can bring threats to themselves at any time, the United States also wants to stifle this threat in the cradle.