An out-of-spec upper-stage strut is the prime suspect in the June 28 failure of a SpaceX Falcon 9 launch vehicle that was bound for the International Space Station (ISS) with a load of supplies and hardware, company found Elon Musk reported Monday. In a teleconference with reporters, Musk said the upper stage exploded while the first stage was still firing after a high-pressure helium bottle broke loose in the upper stage’s liquid oxygen tank and overpressurized the ...

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