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Eight

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seven

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six

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go for main engine start

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four

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three

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two

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one

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zero and liftoff of Space Shuttle Endeavour,

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expanding the International Space Station
while creating a classroom in space.

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After a spectacular liftoff from Kennedy Space
Center in August of 2007,

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Space Shuttle Endeavour settled into orbit
and a 20-year dream was realized by

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teacher-turned-astronaut Barbara Morgan, one
of the seven crew members.

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Mission STS-118's crew also included Commander
Scott Kelly,

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Pilot Charlie Hobaugh,

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and Mission Specialists

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Tracy Caldwell,

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Rick Mastracchio,

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Alvin Drew

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and Dave Williams with the Canadian Space
Agency.

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On the first day in space, Endeavour received
a careful and extensive inspection

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of its thermal protection system with the
orbiter boom sensor system.

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Before docking, Kelly piloted Endeavour through
its backflip maneuver to enable

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the station crew members to photograph the
tiles on the orbiter's belly.

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The inspection revealed a small ding that
after careful analysis,

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mission managers and crew members decided
would not hamper a safe flight home.

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With docking completed, the hatches opened
between the orbiter and station.

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Floating at 17,000 miles per hour and more
than 200 miles above the Earth, the

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Expedition 15 crew welcomed their seven guests.
First-time spacewalkers

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Mastracchio and Williams ventured out of the
station to install the car-sized,

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4,000-pound Starboard 5 truss segment with
the help of the Canadarm operated by

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Hobaugh and Anderson.

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Williams and Mastracchio completed their second
spacewalk

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after installing a 600-pound gyroscope which
controls station orientation,

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replacing one of four that failed in October
of 2006.

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Endeavour was the first orbiter to try out
a new system designed to let the

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orbiter use electrical power from the station
and allow the vehicle to stay in

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space for an extended period of time.

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As part of her duties as mission specialist,
Morgan carried millions of basil

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seeds into orbit and aboard the space station
as part of an experiment.

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Some remained to grow in low gravity; the
rest returned to Earth and will be

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divided into science kits for students to
study.

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Another first on this mission was accomplished
when the astronauts installed the

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7,000-pound external stowage platform using
only the robotic arms of the station

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and the shuttle.

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The platform will be used for storing extra
parts and equipment outside the

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space station.

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A third and fourth spacewalk completed most
of the mission tasks

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before flight control decided to move Endeavour's
undocking a day earlier,

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after reviewing Hurricane Dean's possible
track toward Texas.

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The undocking process went off without a hitch.
A day later,

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mission managers in Houston gave a "go for
deorbit burn"

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and about an hour later, Endeavour glided
to a graceful touchdown at

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Kennedy Space Center's Shuttle Landing Facility
in the early afternoon of

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August 21.

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MISSION CONTROL: Roger, wheels stop,