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SpaceX today scrubbed its Falcon 9 launch of a commercial communications satellite about a half hour before launch time.
They have not revealed why they cancelled, though they report the rocket is in good condition and have rescheduled for the same 6:46 pm (Eastern) launch tomorrow.
Update: It appears they had not gotten the rocket’s liquid oxygen as cold as they want. The colder it is, the denser it is, and the more fuel they can pack into the tank.