The Falcon Heavy has flown before, but now it’s got a payload that matters and competitors nipping at its heels. It’s the first of a new generation of launch vehicles that can take huge payloads to space cheaply and frequently, opening up a new frontier in the space race. Watch it lift off Sunday afternoon (we’ll post a reminder).

On the 7th, Falcon Heavy will fly for the first time since its inaugural test last February, delivering the now-infamous Tesla Roadster and “Starman” into a trajectory that has taken them past Mars. That successful launch garnered SpaceX its first customer for the system, and Sunday’s launch will take Arabsat-6A, a Lockheed-built communications satellite, into geosynchronous orbit.

A static fire today went well, so, weather permitting,

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