Share the QR code < / P > < p > with wechat scanning code to friends and circle of friends < / P > < p > surging journalist Zhang Jing < / P > < p > SpaceX completed the closing work of this year. Falcon 9 rocket was launched 31 times, breaking the record of 26 launches in 2020 < p > at 5:07 EDT on December 21, SpaceX Falcon 9 rocket carried out the 24th commercial supply mission at Kennedy Space Center in Florida, Use the "second-hand" dragon spacecraft to transport 6500 pounds for NASA to the international space station (about 2948 kg) cargo. The spacecraft is scheduled to automatically dock with the space station at about 4:38 on December 22 EDT and stay for about a month, and then return to earth with research and cargo and splash down the coast of Florida. < / P > < p > since Falcon 9 launched Turkey's turksat 5A communication satellite on January 7 EDT, this launch is SpaceX Falcon 9 The 31st launch of the rocket this year is also the final work of this year, while SpaceX completed 26 launches last year < p > it is worth noting that this launch is also the third launch of SpaceX within 72 hours. Previously, 52 "star chain" satellites were launched on the evening of December 18 Beijing time, realizing 11 flying and 11 recovery with one arrow for the first time. 15 hours later, Turkey turksat 5B communication satellite was launched on the morning of December 19 Beijing time < p > < / P > < p > this mission uses a first-hand rocket. After the first and second stage separation, the first stage rocket landed on the unmanned barge "please see the manual" in the Atlantic Ocean, marking the successful completion of SpaceX's 100th orbital stage booster recovery. About 12 minutes after launch, the Dragon spacecraft separated from the second stage of Falcon 9 and began firing a series of thrusters to reach the space station < p > < p > protein crystal growth research is included in the goods transported by this mission, which can improve the way cancer treatment drugs reach patients; There is also a handheld biological printer, which can print tissue directly on the wound in the future to accelerate wound healing < p > at the same time, scientists have observed that space flight sometimes increases the toxicity of potentially harmful microorganisms and may reduce human immune function, thus increasing the risk of infectious diseases. Therefore, the infection risk assessment experiment of this launch will collect the cells of astronauts before, during and after space flight, and culture these cells with bacteria and unchanged bacteria growing under simulated space conditions, so as to evaluate the changes of immune state caused by space. The results are helpful to assess the potential risk caused by infected microorganisms and provide support for the development of countermeasures
2023-03-22 10:04:48