The U.S. Defense Advanced Research Projects Agency (Darpa) plans to seek industry interest next month in an Experimental Spaceplane (XS-1) which will be capable of delivering a payload up to 5,000 lb. to space for less than $5 million per launch. The XS-1 is targeted at flying at Mach 10 plus and generating a sortie rate of up to 10 times over 10 days. The program compliments the agency’s ongoing Airborne Launch Assist Space Access (Alasa) program, which is developing an air launch ...

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