Virgin Galactic LauncherOne Not all smallsat launcher developments pan out, and Darpa has canceled plans to flight-test Boeing’s Airborne Launch Assist Space Access vehicle from an F-15E because of problems with the energetic monopropellant fuel. Designed to place 45 kg into low Earth orbit within 24 hr. of call-up, for $1 million a flight, the 24-ft.-long vehicle had four forward-mounted engines   Firefly Space Systems Alpha Texas-based Firefly Space Systems’ ...

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