今年四月底,美国召开了第20届空间会议,会上对美国的军事空间活动问题进行了讨论。与会的有关专家认为,苏联在空间的威胁正从数量上和质量上不断地增加。主要的威胁将是苏联的反卫星武器和类似于美国土星5的大型运载火箭。反卫星武器对低轨道上的卫星将是一个严重的威胁,而在本世纪末就能投入使用的相当于美国土星5的大型运载 At the end of April this year, the United States held the 20th space conference, at which the issue of U.S. military space activities was discussed. Experts attending the meeting believe that the Soviet threat in space is increasing both in quantity and in quality. The main threat will be Soviet anti-satellite weapons and a large launch vehicle similar to the U.S. Saturn 5. Anti-satellite weapons will pose a serious threat to low-orbit satellites, and large-scale deliveries equivalent to Saturn 5 at the end of the century