The reporter learned from the National Space Administration that at 1:31 am on May 29th, China successfully launched the Tianwen-2 planetary exploration project probe into space using the Long March 3B Y110 carrier rocket from the Xichang Satellite Launch Center. After about 18 minutes of rocket flight, the probe will be sent into a transfer orbit from Earth to asteroid 2016HO3. Afterwards, the solar wings of the probe were deployed normally, and the launch mission was a complete success. The main mission objective of Tianwen-2 is to explore, sample, and return asteroid 2016HO3 to Earth, followed by scientific exploration of comet 311P in the main belt. Asteroid 2016HO3 is one of the Earth's quasi satellites currently discovered by humans. The first objective of the Tianwen-2 mission is to break through a series of key technologies such as surface sampling of weak gravity celestial bodies, high-precision relative autonomous navigation and control, and small thrust transfer orbit design. The second objective is to provide detection data and precious samples for cutting-edge scientific research on the origin and evolution of asteroids. The scientific objective focuses on determining multiple physical parameters of asteroids and main belt comets, including orbit parameters, rotation parameters, shape size, thermal radiation characteristics, and conducting orbital dynamics research; The second is to conduct research on the morphology, material composition, internal structure, and possible ejecta of asteroids and main belt comets; The third is to conduct laboratory analysis and research on samples, determine their physical properties, chemical and mineral composition, isotopic composition, and structural structure, and conduct research on the formation and evolution of asteroids and the early solar system. The successful launch of this mission is only the "first step" in the long exploration process of Tianwen-2 mission. The Tianwen-2 mission has high technical difficulty and engineering risks, including 13 flight stages such as launch, asteroid transfer, asteroid approach, asteroid rendezvous, asteroid close range exploration, asteroid sampling, return waiting, return transfer, re-entry and recovery, main belt comet transfer, main belt comet approach, main belt comet rendezvous, and main belt comet close range exploration. Among them, asteroid exploration and sampling return include 9 stages. After the launch phase is successfully completed, the probe enters the asteroid transfer phase, which will last for about 1 year. During this phase, deep space maneuvering, mid course correction and other operations need to be carried out until it is about 30000 kilometers away from the asteroid. Subsequently, it enters the asteroid approach phase, rendezvous phase, and close range detection phase in sequence. In the close range detection phase, it follows the principle of "flying while exploring, gradually approaching" to conduct hovering, active orbiting, and other explorations of the asteroid. After determining the sampling area, it enters the sampling phase. After completing the sampling task, the probe will go through a return waiting phase and a return transfer phase. In the return transfer phase, it will approach Earth, separate from the main probe, and then enter the re-entry and recovery phase alone. It is expected to land on Earth and complete the recovery by the end of 2027. Afterwards, the main probe continued its flight and headed to the main belt comet 311P to carry out subsequent exploration missions. The detector is equipped with 11 scientific devices, including a mid field color camera, multispectral camera, visible infrared imaging spectrometer, thermal radiation spectrometer, detection radar, magnetometer, charged and neutral particle analyzer, eruption analyzer, narrow field navigation sensor, laser integrated navigation sensor, and rotating diffraction hyperspectral camera. These advanced devices will assist the probe in detecting asteroids and main belt comets during flight and obtaining scientific data. This mission is the 578th launch of the Long March series carrier rocket. The Long March 3B carrier rocket, which carries out launch missions, is the main rocket for China's high orbit launches and also the rocket with the most space launches in China. It has completed 108 launches before and has carried out lunar exploration projects such as Chang'e-3 and Chang'e-4. To ensure the reliability, accuracy, and punctuality of the Long March 3B rocket and to perform well in the Tianwen-2 mission, the designers completed multiple rounds of design iterations over a period of 2 years, while meeting the constraints of all parties, achieving a perfect "handover" between the rocket and the probe. (New Society)