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MIKE CURIE: T-16 seconds. Sound suppression water system has been activated,

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protecting Discovery and the launch pad from acoustical energy.

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We have a go for main engine start. T minus five, four, three,

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two, one, booster ignition and liftoff of Discovery,

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hoisting Harmony to the heavens and opening new gateways for

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international science. Discovery has cleared the tower.

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MISSION CONTROL: Houston now controlling.

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TERRY VITZ: Roger roll, Discovery.

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MISSION CONTROL: Discovery's roll maneuver is complete. It is now in a heads-down position,

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on track for its flight to the International Space Station.

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Discovery seven miles downrange at an altitude of two statute miles,

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flying at 600 miles per hour. Discovery's engines are throttling down as the

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orbiter passes through the area of maximum pressure on the vehicle.

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Now 50 seconds into the flight. Discovery eight miles downrange from

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the Kennedy Space Center at an altitude of six statute miles, flying at 900 miles per hour.