三十多年前一些预言家曾指出,在阿波罗“计划之后将出现商业空天飞机,大型轨道空间站以及人们将在地球和月球聚居地之间往返飞行。目前美国航空航天局正在看手建造国际空间站,还在验证单级入轨可重复使用的运载器技术。除此而外,美国的人类空间探索计划还预想了利用地球以外的资源和开发创新性推进技术,这对到月球而后直到火星的太空旅行将是不可缺少的。今后10年到15年间可能被开发的两项关键技术——月球氧和更先进的推进技术可 Some of the prophets more than thirty years ago pointed out that commercial space planes, large orbiting space stations and people will fly between Earth and the moon after Apollo’s ”plan." NASA is currently watching In addition, the United States’ human space exploration program also envisions the use of resources outside the Earth and the development of innovative propulsion technologies, which will make it easier for the Moon Until Mars’s space travel will be indispensable, the two key technologies that could be developed over the next 10 to 15 years - the lunar oxygen and more advanced propulsion technology