论文部分内容阅读
居高不下的航天运载费用是航天发展的瓶颈,这早就是国际航天界的共识。多年来,美国航天航空局和美军都为此不断努力,但收效甚少。近年来,美国的众多民营航天公司对此大力发展创新技术,取得了可喜的成绩。与此同时,美国国防部高级研究计划局(DARPA)在国防经费削减的压力下,仍然致力于研发新的低成本运载技术。
The high cost of space transportation is a bottleneck in space development, which has long been the consensus of the international space community. Over the years, NASA and the U.S. military have all made persistent efforts to this end, but with little success. In recent years, many private space companies in the United States have made great efforts to develop innovative technologies and have achieved gratifying results. In the meantime, the Defense Advanced Research Projects Agency (DARPA) remains committed to developing new low-cost delivery technologies under the pressure of reduced defense spending.