从苏联1957年10月4日成功地发射了第一颗人造地球卫星开始,太空就变得不那么安宁了。在以后的30年中,航天技术飞速发展,太空军备竞赛愈演愈烈。苏美两个宇航大国发射的近4000个航天器,70%的用于军事。这预示着未来的地球外层空间将成为人类的第四战场。从本期起,我们刊载这方面的知识,以飨读者。——编者 Beginning with the Soviet Union’s successful launch of the first man-made earth satellite on October 4, 1957, space has become less peaceful. In the next 30 years, the rapid development of space technology, the space arms race intensified. Nearly 4,000 spacecraft launched by the two space nations of the Soviet Union and the United States, with 70% used for military purposes. This indicates that the future earth’s outer space will become the fourth battlefield for mankind. Starting from this issue, we publish this knowledge to readers. --editor