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美国国防高级研究项目局(DARPA)5月24日宣布选定由波音公司来承担“实验性航天飞机”(XS)1项目第二和第三阶段研制工作,以研制一种有望降低中型有效载荷发射成本的实验性可重复使用第一级。XS-1项目的目标是要能在10天内飞行10次,验证快速反应和低成本航天发射能力。第二阶段包括飞行器研制和地面试验,时间到2019年。将在2020年开展
The Defense Advanced Research Project Agency (DARPA) announced on May 24 that it will select Boeing Co. to undertake the second and third phases of its experimental Space Shuttle XS 1 project in order to develop a new medium- Experimental reusable payload launch cost level one. The goal of the XS-1 project is to fly 10 times in 10 days to verify rapid reaction and low-cost space launch capability. The second phase includes aircraft development and ground testing, by 2019. Will be carried out in 2020