提供永久免费的API接口，查看更多API接口，如果您有其他免费API资源，请联系我们，造福人类。

定制开发，免费评估，免费咨询，价格便宜，售后保障，前往开发服务中心或联系开发客服中心

Scan the QR code with wechat < / P > < p > to share with friends and circle of friends < / P > < p > according to foreign media reports, on Wednesday, local time, NASA (< a target = "_ blank" href=" https://news.163.com/news/search?keyword=NASA "> NASA < / a >) announced that its < a target ="_ blank" href=" https://news.163.com/news/search?keyword=%E5%AE%87%E8%88%AA%E5%91%98 "> astronaut < / a > mark Vande Hei will take the Russian Soyuz, which is scheduled to launch on April 9_ blank" href=" https://news.163.com/news/search?keyword=%E9%A3%9E%E8%88%B9 "> spaceship < / a > to < a target ="_ blank" href=" https://news.163.com/news/search?keyword=%E5%9B%BD%E9%99%85%E7%A9%BA%E9%97%B4%E7%AB%99 "> International Space Station < / a >. < / P > < p > < / P > < p > this reflects NASA's long-standing "redundancy" strategy. Robyn Gatens, acting director of NASA's international space station program, said: "we often use the word to make sure there is a backup plan in all cases, just in case." < / P > < p > photo: NASA astronaut mark vandeher will take the Russian Soyuz spacecraft to the international space station next month < / P > < p > the most typical example of this practice is NASA's "commercial astronaut program", which hired SpaceX and Boeing in 2014 to develop transportation vehicles to and from the space station. After many delays, SpaceX finally completed its first commercial manned mission last year, sending NASA astronauts to the space station and returning to earth in six months; the second similar mission will be launched in late April, and SpaceX manned dragon spacecraft is ready. < / P > < p > however, Boeing is still testing its Starline spacecraft, and its first official mission may be delayed until 2022. This obviously makes NASA uneasy, because it is worried that SpaceX alone can not ensure regular manned flight, which is the biggest reason for the agency to choose two different commercial manned service providers at the beginning of the project: if one aircraft has problems, the other can take over. < / P > < p > since the end of the space shuttle program in 2011, NASA has never launched an astronaut in the United States. Since then, the agency has always bought seats on the Russian space agency Soyuz spacecraft, relying on it to send astronauts to the international space station. < / P > < p > for a long time, NASA has always believed that the beginning of commercial manned flight to the space station should not mark the end of NASA astronauts taking Soyuz spacecraft. On the contrary, even in the era of commercial manned space, NASA has always advocated cooperation with Russia < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E8%88%AA%E5%A4%A9%E5%B1%80 "> NASA < / a > exchanges seats on the spacecraft to ensure that both sides will not lose the opportunity to enter space in the event of problems with a certain aircraft. < p > < p > Steve jurczyk, NASA's acting director, said NASA believes that after three successful manned flights, the Russian space agency will be willing to send astronauts to the US spacecraft. SpaceX's second commercial manned flight (crew-2) will be the third manned flight of its manned dragon spacecraft. The Russian Space Agency refused to confirm the "three flights" strategy, only admitting that the two sides are negotiating for Russian astronauts to fly in US commercial spacecraft. (small) < / P > < p >

2023-03-22 10:04:30