SpaceX launch for Crew Dragon NASA mission: Live updates

All of the preliminary {hardware} and communications checks are performed, the astronauts are strapped into their seats, and launch officers have given the go-ahead to begin loading the Falcon 9 rocket up with gas.

The propellants used are RP-1, or “Rocket Propellant 1,” and “LOX” — or “liquid oxygen.”

The oxygen is made so chilly that it turns liquid, and after LOX loading, viewers will be capable to see what seems like steam or smoke emanating from the rocket. That’s simply the super-chilled oxygen boiling off the aspect of the rocket as the encompassing air heats a number of the extra LOX.

More than 1 million kilos of propellant might be funneled into the Falcon 9 over the subsequent half hour. Meanwhile, the astronauts are nonetheless sitting tight contained in the Crew Dragon capsule, which sits atop the rocket.

CNN’s Rachel Crane has extra:

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