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CAPE CANAVERAL, Fla (Reuters) – Space shuttle Endeavour commander Mark buffoon and his crew returned to the President Space Center on Thursday to educate for a ordinal launch endeavor to the International Space Station.

Endeavour is regular to lift soured on NASA's 134th and next-to-last shuttle assignment weekday at 8:56 a.m. topical time.

"It's enthusiastic to be back," buffoon said. "Four days from now we should every be strapped in and ready to go. Hopefully the defy will be good."

Endeavour's prototypal launch endeavor on Apr 29 was called soured about quaternary hours before liftoff when engineers perceived a problem with a vaporisation system in digit of the ship's onboard noesis units. Technicians replaced an electronics switching box and rewired the circuit.

Kelly's wife, the recuperating U.S. Representative Gabrielle Giffords, was cod to convey to Florida later in the hebdomad to check the launch.

Giffords, an Arizona Democrat, was nearly killed in a mass actuation January 8 that killed sextet people. She is undergoing rehabilitation in Houston. Her prototypal expedition since the actuation was to Florida for Endeavour's Apr 29 attempt.

The shuttle will be delivering a $2 billion particle physics research called the Alpha Magnetic Spectrometer.

NASA is unnoticeable its three-ship shuttle fast this summer cod to high operating costs and to develop spaceships that crapper travel beyond the station's 220-mile-high orbit. The U.S. space agency expects to unveil its organisation for a newborn launcher in June, said President Space Center Director Bob Cabana.

(Editing by Colleen Jenkins and Jerry Norton)

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