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SpaceX: 10,
9,

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8…

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NASA Launch Commentator Josh Finch: Seven,
six,

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five,
four,

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three,
two,

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one,
zero.

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And liftoff of the Falcon 9 rocket and a Dragon
spacecraft packed with science and supplies

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for the International Space Station, humanity’s
home in low-Earth orbit.

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The Falcon 9 has cleared the tower.

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SpaceX ascent commentary is performed by several
people.

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Propulsion engineer calls out propulsion events.

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Avionics engineer calls out avionics health
and Dragon separation.

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The range coordinator calls Air Force satellite
control network acquisition and loss of signal.

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And the ground station specialist calls out
the SpaceX antenna acquisition and loss of

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signal.

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We are 40 seconds into the flight of the Falcon
9.

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One minute, five seconds after liftoff, Falcon
9 will reach transonic speed.

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The vehicle will pass through an area of maximum
aerodynamic pressure called max Q.

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At one minute, 18 seconds after liftoff, this
is the point where mechanical stress on the

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rocket reaches its peak because of the rocket’s
velocity and resistance created by Earth’s

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atmosphere.

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And the vehicle is supersonic.

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Ascent commentator: Vehicle is experiencing
maximum dynamic pressure.

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Finch: And confirmation of max Q.

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One minute, 30 seconds into flight.

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And the second-stage engine chill has begun.

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Around two minutes, 35 seconds into flight,
the nine Merlin engines will sequentially

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shut down.