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NASA于 1984年 4月用挑战者号航天飞机发射的长期暴露装置（LDEF） 将于明年1月再次闯入大气层,坠落地面的危险性很大。NASA已拟制一项抢救计划,打算用今年12月18日发射的哥伦比亚号航天飞机把这颗卫星救出,然后带回地面。 发射该卫星的目的是将
NASA The long-term exposure device (LDEF) launched by the Challenger space shuttle in April 1984 will re-enter the atmosphere in January next year and the danger of falling to the ground is high. NASA has drafted a rescue plan with the intention of rescuing the satellite from the space shuttle Columbia on December 18 this year and bringing it back to the ground. The purpose of launching this satellite is to be