The Defense Advanced Research Projects Agency (Darpa) has notified bidders of a change in its plans for the XS-1 experimental spaceplane program to demonstrate a reusable first stage capable of launching 3,000-5,000-lb. satellites into low Earth orbit.   In a late-March amendment to its broad area announcement (BAA) inviting proposals for the XS-1, Darpa says it now plans to conduct another competition for the later phases of the program, if it decides to proceed, rather than ...


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