Go for main engine start. We have main engine start. 2, 1, booster ignition, and the final lift off of discovery. Attribute to the dedication, hard work, and pride of America's space shuttle team. The shuttle is clear of the tower. This mission control is to the space shuttle now rolled over to go wrong to its back. They haven't been arrived in Torvitz. Discovery now making one last reach for the stars. Discovery's engines are now throttling down as the orbiter passes through the area of maximum pressure reducing the stress on the shuttle as it goes supersonic. Discovery Houston, you are go and throttle up. Commander Steve Lindsey acknowledging the call from Capcom Charlie Hobie is discovery three main engines throttle back up. Lindsey is joined on the flight deck by pilot Eric Bowen, mission specialist Al Juru and Nicole Stant. Mission specialist Mike Barrett and Steve Bowen. Discovery's three main engines are burning fuel at a rate that would drain an average swimming pool in about 25 seconds. The engines combined with the solid rocket boosters produce more than 7 million pounds of thrust. One minute 50 seconds into the flight we're standing by for separation of the twin solid rocket boosters, discovery now traveling 2,695 miles an hour. It's altitude 24 miles, down range from the Kennedy Space Center 29 miles. The booster separation confirmed discoveries guidance is now converging as the shuttle's onboard computers fine tune the flight.