00:00...five degrees away to clear the way for Falcon 9's launch.
00:06At this point in the countdown, both the first and second stages are nearly fully loaded with 1 million pounds of kerosene fuel and liquid oxygen.
00:13The first stage and second stage should finish loading liquid oxygen.
00:17And there you just heard, the first stage has finished LOX loading.
00:21Liquid oxygen loading for the first stage is the final propellant load for the booster.
00:26The tanks are also pressurized using helium, which is chilled, so that it stays compatible with the cryogenic plumbing.
00:33During flight, that pressurization helps force propellant into the engines as the tanks empty.
00:38At T-minus 60 seconds, Falcon 9 will enter startup.
00:41At that point, the rocket's onboard flight computers will take over, and from there on out, the countdown will be fully autonomous.
00:47Just inside of T-minus 2 seconds, the nine Merlin 1D engines will ignite, and once they're at full power, Falcon 9 will lift off the pad and begin its climb to orbit.
00:54After that engine start, the Falcon vehicles are held down until all vehicle systems are verified as functioning normally before we release for liftoff.
01:04Stage 2 LOX load is complete.
01:16And liquid oxygen for the second stage is now fully loaded, completing prop load for the upper stage.
01:21You can see white condensation clouds starting to vent from the rocket.
01:30As the liquid oxygen warms slightly inside the tanks, some of it will boil off, and that gas is vented to manage pressure.
01:37When the vented oxygen hits the warm, humid outside air, it will instantly condense into clouds, which is the same principle as your breath on a cold morning.
01:45Ground gas close out.
01:46Standing by now for confirmation that Falcon 9 is in startup at the T-minus 1-minute mark.
02:01Falcon 9 is in startup.
02:17As you just heard, the autonomous flight computers have taken over the launch countdown, and stages 1 and 2 are pressurizing for launch.
02:24Go for launch.
02:32We just heard the launch director give the final go.
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