Few sights are as awe-inspiring as the liftoff of a space shuttle. Propped on its pair of solid-rocket boosters, the shuttle towers over the launchpad at the Kennedy Space Center in Cape Canaveral, Fla. Hundreds of engineers and technicians man the consoles in the Launch Control Center , monitoring the shuttle’s systems as the countdown proceeds. Half a minute before liftoff, the shuttle’ s onboard computers take over the launch sequence, and at T minus six seconds they send the command to start the main engines. Fiery exhaust billows downward from the shuttle’s three rocket nozzles. At T minus zero, the solid-rocket boosters ignite, the umbilical lines retract and the shuttle climbs into the sky with 3.6 million kilograms (eight million pounds) of thrust.
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