(NBC News) SpaceX has identified the cause of its September rocket explosion at Cape Canaveral and has set a return-to-flight date. SpaceX says a helium bottle in the rocket’s second stage buckled during fueling, causing extra pressure that made it burst. The explosion during a pre-launch engine test rattled buildings for miles around; destroyed a $200 million satellite and severely damaged the launch pad. The explosion is echoing throughout NASA because its astronauts are scheduled to fly on a SpaceX rocket next year.
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