继2015年5月波音公司获得NASA首个商业乘员轮换任务合同后,SpaceX公司也于近期获得了该任务合同。根据合同,SpaceX将于2017年底向国际空间站发射Dragon载人飞船,这将是美国私营航天公司首次向国际空间站运送航天员。NASA表示,其一般都会在任务执行前的2~3年签订合同,以便为服务供应商留下充足的时间组织制造、调试火箭和飞船。根据合同,波音和 Following the Boeing Company’s acquisition of NASA’s first commercial occupant rotation task contract in May 2015, SpaceX also recently obtained the task contract. According to the contract, SpaceX will launch the Dragon manned spacecraft to the International Space Station at the end of 2017. This will be the first time that the United States’ private space company will transport astronauts to the International Space Station. NASA said that it will generally sign contracts two to three years before the mission is executed, so as to leave enough time for service providers to organize the manufacture and debugging of rockets and spacecraft. According to the contract, Boeing and