https://qz.com/1199146/spacex-falcon-heavy-elon-musk-explains-five-ways-the-rocket-launch-could-go-wrong/

Today’s launch of an enormous new SpaceX rocket is a test, and it could go wrong. But that’s so vague—what, exactly, can turn this unmanned 20-story launch vehicle, filled with tons of explosive propellant, into a very expensive firecracker?

SpaceX CEO Elon Musk himself explained some of the ways that could happen yesterday, before today’s attempt to send the Falcon Heavy, carrying a Tesla roadster, into orbit around Mars. “I’m sure we’ve done everything we could do to maximize the chances of success of this mission,” Musk said, describing himself as “giddy” and “at peace.”