This time they lost three small satellites and the ashes of 208 people, including Star Trek alum Jimmy Doohan and astronaut Gordon Cooper.
It appears to have been a problem with stage separation:
"Four methods of analysis, vehicle inertial measurement, chamber pressure, on-board video and a simple physics free body calculation, all give the same answer. [Residual thrust caused] the first stage to recontact the second stage," says SpaceX chief executive Elon Musk.
According to SpaceX, unburned fuel in the engine's cooling channels and manifold combined with residual oxygen to produce enough thrust to overcome the separation impulse. The solution is to increase the time between commanding main engine shutdown and stage separation.
Bummer for the families involved.
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