The US "space" website said on September 13:
Whether the planetary defense plan for human beings to "defend the earth" can work, the impact test on the 26th will be clear.
What is this situation?
It turns out that the United States invented a spacecraft, which aims to impact asteroids and test its actual impact on the asteroid trajectory. If an asteroid threatens the earth in the future, scientists hope that tasks like DART can avoid disasters.
Beijing time on November 24, 2021 at 14:20 pm, Beijing time, according to reports:
NASA's dual asteroid redirection test mission DART detector will be sent into the universe by the Falcon 9 rocket of SpaceX. It is different from detectors such as Lucy or Parker. DART will not send back any detection data, and its mission is to destroy.
Yes, it is to complete NASA's first spacecraft suicide mission - by using a spacecraft to hit the asteroid, causing it to deviate from the orbit that hits the earth.
DART probe is a spacecraft studied by the United States. According to plan, DART will fly alone for nearly a year after separation from the rocket, and crashed into a smaller asteroid in a near-Earth "Twins" asteroid system in September 2022 to change its orbit.
Which two asteroids are assassinated
DART selected an asteroid called Dimorphos, which has a diameter of about 160 meters. and orbit another near-Earth asteroid called Didymos with a diameter of 800 meters in a period of 11 hours and 55 minutes.
These two asteroids are about 11 million kilometers away from the earth and will not pose any threat to the earth. Some people will say that it will not threaten the earth and destroy them?
In fact, this is also the first time we try to remove planets that threaten the earth. will definitely need to be tested multiple times. It is impossible to attack directly by . So to ensure safety, we chose to stay away from the earth.
According to NASA's calculations, after the vending machine-sized detector impacts the asteroid at a speed of 6 kilometers per second, the latter's orbital period will be shortened by about 10 minutes.
DART How to determine the target hit?
says it very simple, but it is very complicated to operate. According to reports, what DART tested was only one of the means of planetary defense planning. How effective the and impact depends on many factors. We have to confirm the composition of the asteroid first, whether it is solid rock or loose piles of gravel?
If it is the former, it is like playing "billiards", but if it is composed of thousands of gravel, it is much harder to predict the consequences of the impact.
In order to achieve more intuitive observation impact effect, NASA also used the James Webb Space Telescope, Hubble Space Telescope and 4 ground observatories to monitor it in turn. to determine the amount and composition of dust and volatiles (prone substances) released during the impact.
and also use 's internally developed Evolution Task Trajectory Generator (EMTG) to independently verify and verify DART task trajectory at various stages of task development, and evaluate the task's ability to adapt to missed thrusts and other emergencies.
Berkeley Goddard, California and Bruno Sally of Solar Space, said, "We also use EMTG to support independent trajectory optimization studies of DART. These studies evaluate the optimal flight path for the spacecraft based on the goals, capabilities and limitations of the spacecraft."
If this is successful, scientists will further research and apply the same technology to planets .
I think for everyone, there is no intuitive feeling about the so-called "planets hit the earth". But we can use a set of data to see the serious impact of near-Earth asteroid impacts.
Although the probability of an asteroid hitting the earth is not very high, we must prevent problems before they happen. Hiroshima atomic bomb incident caused 88,000 deaths and more than 51,000 injuries and missing. If an asteroid with a diameter of 140 meters hits the earth, the damage value will be directly increased by a thousand times, , which is enough to show that the destructive power of "asteroid impacting the earth".
For this situation, no country can be immune to it, which means it must start preparing for the "Planetary Defense Plan".
and we in China also have a "Planetary Defense Plan".
On April 25, 2022, according to the Russian satellite news agency sputniknews, Wu Yanhua, deputy director of the State Space Administration of China, said in an interview with CCTV reporters recently that China will start to form a near-Earth asteroid defense system to jointly respond to the threat of near-Earth asteroid impact and contribute Chinese strength to protect the earth and human security.
Wu Yanhua also praised, "We must start to improve the construction of a ground-based monitoring and early warning system for asteroids. In this way, we must not only catalogue, but also the key is to analyze which ones are serious and dangerous to make judgments. The second is to study and explore relevant technologies and projects. Whether it is possible to eliminate these threats, we must conduct relevant technical research and research."
Monitoring and early warning require two technologies to be applied, one is "space exploration" and the other is "supercomputing". After finding the asteroid, the next thing to do is to calculate whether it is possible to hit the Earth. Once the target is discovered by , we must be prepared to protect the earth.
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