国际空间站建造和使用阶段的头４年中，需要发射４４次。其中，美国航天飞机２７次，俄罗斯１５次，欧洲阿里安－５火箭至少１次。据空间站计划人员称，除了协调这些发射任务外，航天员需进行５００人时以上的舱外活动，以装配空间站的硬件。在２００２年空间站建成前，俄罗斯 During the first four years of the stage of construction and use of the ISS, 44 launches were required. Among them, the U.S. space shuttle 27 times, Russia 15 times, the European Ariane -5 rocket at least once. According to space station planners, in addition to coordinating these launch missions, astronauts need to carry out extravehicular activities for more than 500 people to assemble space station hardware. Before the completion of the space station in 2002, Russia