SpaceX believes helium system breach caused recent Falcon 9 explosion

When one of SpaceX‘s Falcon 9 rockets abruptly exploded without warning earlier this month, the space agency and founder Elon Musk were left confused and in the dark about what happened, resulting in a big mystery. The rocket, which was to deliver a Facebook satellite into space, was undergoing a routine filling operation, but its engines were inactive. Now SpaceX …