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新一代航天飞机美国国家航空和航天局目前选中洛克希德—马丁公司开发新一代航天飞机样机。这种可重复使用的楔行Ｘ—３３航天飞机将是美国２５年来第一个大型新式航天器。它是朝取代旧式航天飞机方向迈出的一步，并且将根据一个计划建造。该计划打算把开发高风险技术的一...
A new generation of space shuttle NASA currently selected Lockheed Martin to develop a new generation of space shuttle prototype. The reusable Wedge X-33 space shuttle will be the first major new spacecraft in the United States in 25 years. It is a step toward replacing the old space shuttle and will be built according to a plan. The plan intends to develop a high-risk technology ...