WEBVTT

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We're now close to entering the final five and a half hours of the countdown toward the

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last flight of space shuttle Endeavour on mission STS-134.

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The countdown is being controlled from   Firing Room 4 at the Launch Control Center

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here at Complex 39 at the Kennedy Space Center in Florida.

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And we are on schedule for liftoff targeted for 8:56 a.m. Eastern time.

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This is the 134th launch of the 
Space Shuttle Program, the 25th launch of s
pace shuttle   Endeavour,

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and the 36th flight to the 
International Space Station.

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Endeavour will deliver the Alpha Magnetic 
Spectrometer, called AMS-2,

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a particle physics detector designed to 
search for various types of unusual matter 
by measuring cosmic rays.

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Its experiments are designed to help 
researchers study and look for clues to the 
formation of the universe.

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Endeavour will also bring up to the station, 
the Express Logistics Carrier-3, an external 
platform for the space station,

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that holds large equipment that will carry 
spare parts and equipment to sustain the 
space station's

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operations in space once the last space 
shuttle flight has occurred this summer

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There are four planned EVAs, or spacewalks, 
outside the International Space Station 
during the

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STS-134 mission to do maintenance and install
 new components.

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These will be the last scheduled spacewalks 
by the space shuttle crew for the remainder 
of the program.

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Meanwhile, the Final Inspection Team has been m
easuring the temperatures on the surface of 
the vehicle

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looking for any ice buildup and performing a 
final check for any FOD,

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or foreign object debris that could strike 
the orbiter upon ignition.

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The seven-member crew will have walked up 
and down the entire 380-foot tower of the

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fixed service structure at the conclusion 
of their inspections.

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Weather continues to be favorable with just 
a 30 percent chance of not meeting our launch 
weather criteria this morning.

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A slight chance for a low cloud ceiling and 
a crosswind, but at least at this point 
and time, neither is being observed.

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We have one hour, 28 minutes, 24 seconds 
remaining in this planned built-in hold.

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At T-minus three hours and holding, 
this is Shuttle Launch Control.