3月26日,我国在太原卫星发射中心用长征二号丙改进型运载火箭,再度把美国摩托罗拉公司制造的两颗铱星送上预定轨道。连同去年12月8日首次发射成功的两颗铱星,我国已完成发射4颗铱星的任务。按照中国长城工业总公司与美国摩托罗拉公司于1993年4月签订的发射合同,今年我国还将用一箭双星的方式两次把4颗铱星送入太空运行。 铱星系统是美国摩托罗拉公司设计的全球移动通信系统,人们比喻它是建在太空的一条信息高速公路。这个系统在距地球高度为780千米左右的轨道上,按化学元素“铱”的原子序数排列,在6个运行面上 March 26, China’s launch center in Taiyuan Satellite Long March II C improved carrier rocket, once again to the United States Motorola made two Iridium satellite orbit. Together with the two Iridium that were successfully launched on December 8 last year, China has completed the mission of launching four Iridium stars. According to the launch contract signed by China Great Wall Industrial Corporation and Motorola AG of the United States in April 1993, this year China will also launch four Iridium Iatellites into space twice in a one-star, two-star manner. Iridium satellite system is designed by the United States Motorola’s global system of mobile communications, people likened to it is an information highway built in space. This system is arranged on the orbit at a height of about 780 km from the Earth by the atomic number of the chemical element “iridium”, on six running surfaces