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自挑战者号航天飞机发生事故以来,NASA又准备了四架航天飞机轨道器来执行美国的飞行计划。最新的一架航天飞机“奋进号”已于五月初交付肯尼迪空间中心。在四月,航天飞机进行了两次飞行,其中一次是带有伽玛射线观察站的STS—37,另一次是执行战略防御倡议(SDI)研究任务的STS—39。同时,进行空间实验室生命科学任务的哥伦比亚号在五月下旬上天,接着携有跟踪和数据中继卫星的阿特兰蒂斯号将于七月升空。
Since the accident at Space Shuttle Challenger, NASA has also prepared four space shuttle orbiters to implement the U.S. flight plan. The latest Space Shuttle Endeavor was delivered to the Kennedy Space Center in early May. In April, the space shuttle made two flights, one of which was the STS-37 with a gamma-ray observation station and the other was STS-39 that performed the strategic defense initiative (SDI) research mission. At the same time, the Columbia, which performs the life science mission in space laboratories, will come to heaven in late May, followed by the Atlantis, with its tracking and data relay satellites, to be launched in July.