论文部分内容阅读
人类征服空间的理想直到1903年飞机发明之后才有了实质性的进展。第二次世界大战以来,随着空间科学技术的发展,人们开始注意到对宇宙空间的探索和利用。几十年来,人类外空活动的进程十分惊人。继1957年10月苏联发射人类第一颗人造卫星后,1961年4月就有了载人宇宙飞船,到1965年底,美国的宇宙飞船已能在外空停留长达14天之久。1967年7月,人类首次登上月球;次年,苏联的宇宙飞船飞抵金星。1981年4月,美国率先使用航天飞机,这种运载工具可多次重复使用,经济效益极高。同时,外空飞行器(flight vehicle)
The ideal of human conquest of space did not materially advance until after the plane was invented in 1903. Since the Second World War, with the development of space science and technology, people began to notice the exploration and utilization of space. For decades, the process of human space activities has been staggering. Following the launch of the first man-made satellite by the Soviet Union in October 1957, the manned spacecraft was launched in April 1961 and by the end of 1965 the U.S. spacecraft had been able to stay in outer space for as long as 14 days. In July 1967, humans first made their way to the moon; the following year, the Soviet spacecraft flew to Venus. In April 1981, the United States took the lead in using the space shuttle. This vehicle can be reused many times and its economy is extremely high. Meanwhile, the flight vehicle