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Share with friends and circle of friends with wechat scan QR code < / P > < p > (Observer News) on the morning of April 24, the opening ceremony of 2021 China space day was held in Nanjing, Jiangsu Province. Zhang Kejian, director of the National Space Administration, revealed that China's space industry will demonstrate the construction of < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E8%BF%91%E5%9C%B0%E5%B0%8F%E8%A1%8C%E6%98%9F "> near Earth Asteroid < / a > defense system In his speech, Zhang Kejian, director of the National Space Administration, said: "standing at a new historical starting point, China Aerospace will demonstrate the implementation of the fourth phase of the lunar exploration project, the planetary exploration project, the construction of the international lunar scientific research station and the near Earth Asteroid defense system, opening a new chapter of nine days of exploration in the new era." < p > (screenshot of China News Live) < / P > < p > in June 2019, "near ground < a target ="_ blank" href=" https://news.163.com/news/search?keyword=%E5%B0%8F%E5%A4%A9%E4%BD%93 "> small objects < / a > investigation, defense and development" was selected as 20 major scientific and engineering problems in the 21st Annual Meeting of China Association for science and technology. At present, China's asteroid exploration mission has been announced, and plans to use about 10 years to carry out near Earth Asteroid 2016 Ho3 companion flight detection and sampling return, and the main belt < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E5%BD%97%E6%98%9F "> comet < / a > 133p Experts call for the establishment of a national near Earth Asteroid defense system as soon as possible. There is a big gap with foreign countries in asteroid monitoring and early warning, in orbit disposal and other technologies At that time, Gong Zizheng called on China to establish a national coordination center for near Earth Asteroid defense as soon as possible, organize and coordinate small object monitoring and early warning, hazard assessment, security defense and emergency response, and take the lead in formulating the development roadmap of China's small object defense system. We need to develop a ground-based and space-based integrated small object monitoring and early warning platform, and form a near Earth Asteroid monitoring and early warning capability with Chinese characteristics. Establish an asteroid monitoring database with international influence and release relevant information At the same time, he proposed to lay out the research on Key Technologies of small object defense, carry out the verification of key technologies of small object defense mission, establish the ground simulation laboratory of small object defense mission, and timely start the implementation of China's leading small object active security defense mission. In addition, China should strengthen the basic research of near Earth Asteroid defense In February 2021, science in China: Information Science also published an article by Li Haitao, Liu Jianjun, Chen Shaowu and other scholars, "Discussion on the requirements and technical approaches of building China's near Earth Asteroid detection radar system." < p > the paper holds that the planetary radar systems in use in the world are mainly Goldstone and Arecibo planetary radars in the United States. As a member unit, China National Space Administration has officially joined the international asteroid early warning network in January 2018. China is located in the eastern hemisphere. If we build the near Earth Asteroid detection radar system, it can complement the two planetary radars of the United States in the western hemisphere in the coverage period. It can continuously track and monitor the near Earth Asteroids with the threat of hitting the earth, and greatly improve the efficiency of identification and evaluation. At the same time, it also reflects that China, as a space power, undertakes the responsibility of the community of human destiny, which is an important measure to build a space power, and can effectively enhance China's international discourse in the field of near Earth Asteroid defense Chinese scientists have proposed a new plan to defend large-scale asteroids by striking stones with stones. < p > < p > Planetary Defense is to destroy the structure or deflect the orbit of asteroids by active means, such as nuclear explosion, kinetic energy impact, laser ablation, ion beam traction, gravitational drag, mass drive, etc < p > in order to solve the problem that classical kinetic energy impact cannot effectively defend against large asteroids under the condition of short warning time, researcher Li Mingtao, Dr. Wang Yirui, assistant researcher Wang Youliang, researcher Zhou Binghong and associate researcher Zheng Wei of the Key Laboratory of electronic information technology for complex space systems of Chinese Academy of Sciences proposed the concept of enhanced kinetic energy impact planetary defense mission of "hitting a stone with a stone", By launching an unmanned aerial vehicle to capture a small asteroid or collecting more than 100 tons of rock on a gravel pile asteroid, the combined impactor is formed with the aircraft to control the combined body to impact an asteroid with potential threat to the earth and deflect the potential threat asteroid out of the orbit of the earth Compared with the classical kinetic energy impact method, the orbit deflection effect of asteroids can be improved by one order of magnitude, which provides a new option for defense against large-scale potential threat asteroids besides nuclear explosion < p > this achievement was published online in scientific reports, a comprehensive journal of Springer Nature Publishing Group in 2020, and the reviewers commented on the article as "novel, interesting and potentially very efficient methods for defense against dangerous asteroids". The author was also invited to publish an article in the natural astronomy research community of the nature website to introduce the "stone strike stone" planetary defense method

2023-03-22 10:04:32