WEBVTT

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Candrea Thomas/NASA Launch Commentator: Twelve... ten?.

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Kennedy Launch Control:

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BOS is "go" for main engine start.

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Candrea Thomas/NASA Launch Commentator:

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Six?five...four?three?two? one?and booster ignition. Liftoff of

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space shuttle Discovery, taking the space station to full power for

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full science.

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Houston Launch Control:

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This is Mission Control Houston.

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Kennedy Launch Control:

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Discovery roll program.

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Lee Archambault/STS-119 Commander:

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Roger roll Discovery.

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Houston Launch Control:

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Discovery's roll maneuver is complete. It is now in a heads-down

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position on track for its flight to the International Space Station.

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Discovery flying 365 mph, 1 1/2 miles in altitude, seven miles

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downrange from the Kennedy Space Center. Discovery's engines

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are throttling down as the orbiter passes through the area of

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maximum pressure on the vehicle.

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Kennedy Launch Control

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Discovery go at throttle up.

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Lee Archambault/STS-119 Commander

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Discovery go at throttle up.

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Houston Launch Control

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Three main engines on board are throttling back up. Now one

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minute, 12 seconds into the flight, Discovery flying at 1,800 mph,

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10 miles in altitude and 11 1/2 miles downrange from the Kennedy

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Space Center. At liftoff the fully fueled shuttle boosters and

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external tank weighed 4 1/2 million pounds. The total thrust at

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launch was 6,425,000 pounds. All systems continue to function

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well. Three good main engines, three good power-generating fuel

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cells and three good auxiliary power units for the hydraulic system.

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We will now standby for burnout and separation of the solid rocket

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boosters. Combined, the twin boosters provide 5.3 million pounds

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of thrust to propel the orbiter toward space.   Discovery now flying

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3,600 mph, 32 miles in altitude, 43 miles downrange from the

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Kennedy Space Center.