CAPE CANAVERAL—SpaceX’s Falcon 9 rocket now has two flights under its belt incorporating an upgraded version of the composite overwrapped pressure vessels (COPVs) implicated in a 2016 pad explosion. In the course of investigating why a Falcon 9 burst into flames on the pad in September 2016, SpaceX, NASA and the U.S. Air Force agreed that future versions of the booster would include upgraded COPVs, which are filled with liquid helium to maintain tank pressure in the ...


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