Space Shuttle Endeavour On Its Way

The space shuttle Endeavour STS-134 sits on launch pad 39A after the rollback of the Rotating Service Structure at the Kennedy Space Center in Cape Canaveral, Florida May 15, 2011. Endeavour and its six-man crew will deliver a unique astronomical and particle physics experiment to the International Space Station. The $2 billion Alpha Magnetic Spectrometer is designed to illuminate dark matter and other exotic forms of nature that so far have eluded scientists' grasp. REUTERS/Scott Audette

The space shuttle Endeavour STS-134 sits on launch pad 39A after the rollback of the Rotating Service Structure at the Kennedy Space Center in Cape Canaveral, Florida May 15, 2011. Endeavour and its six-man crew will deliver a unique astronomical and particle physics experiment to the International Space Station. The $2 billion Alpha Magnetic Spectrometer is designed to illuminate dark matter and other exotic forms of nature that so far have eluded scientists' grasp. REUTERS/Scott Audette

The space shuttle Endeavour STS-134 sits on launch pad 39A after the rollback of the Rotating Service Structure at the Kennedy Space Center in Cape Canaveral, Florida May 15, 2011. Endeavour and its six-man crew will deliver a unique astronomical and particle physics experiment to the International Space Station. The $2 billion Alpha Magnetic Spectrometer is designed to illuminate dark matter and other exotic forms of nature that so far have eluded scientists' grasp. REUTERS/Pierre Ducharme

A NASA worker looks on as the Rotating Service Structure rolls back to reveal the space shuttle Endeavour STS-134 as it sits on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida May 15, 2011. Endeavour and its six-man crew will deliver a unique astronomical and particle physics experiment to the International Space Station. The $2 billion Alpha Magnetic Spectrometer is designed to illuminate dark matter and other exotic forms of nature that so far have eluded scientists' grasp. REUTERS/Scott Audette

The space shuttle Endeavour STS-134 sits on launch pad 39A after the rollback of the Rotating Service Structure at the Kennedy Space Center in Cape Canaveral, Florida May 15, 2011.Endeavour and its six-man crew will deliver a unique astronomical and particle physics experiment to the International Space Station. The $2 billion Alpha Magnetic Spectrometer is designed to illuminate dark matter and other exotic forms of nature that so far have eluded scientists' grasp. REUTERS/Scott Audette

The space shuttle Endeavour STS-134 sits on launch pad 39A as the suns sets at the Kennedy Space Center in Cape Canaveral, Florida May 15, 2011. Endeavour and its six-man crew will deliver a unique astronomical and particle physics experiment to the orbiting outpost. REUTERS/Scott Audette

Space shuttle Endeavour crew (L to R) Pilot Gregory Johnson, Roberto Vittori, Commander Mark Kelly and Mission Specialist Michael Fincke depart crew quarters for launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida May 16, 2011. REUTERS/Molly Riley

The crew of space shuttle Endeavour departs their quarters for Launch Pad 39A at the Kennedy Space Center in Cape Canaveral, Florida May 16, 2011. Endeavour is scheduled to begin Mission STS-134 to the International Space Station. From left are Mission Specialist Greg Chamitoff, Mission Specialist Drew Feustel, Mission Specialist Roberto Vittori of Italy and the European Space Agency, Pilot Greg H. Johnson and Mission Commander Mark Kelly. REUTERS/Pierre Ducharme

Journalists gather to cover the launch of the space shuttle Endeavour STS-134 as the sun rises at the Kennedy Space Center in Cape Canaveral, Florida May 16, 2011. Launch pad technicians began filling shuttle Endeavour's fuel tank on Monday for a launch attempt at 8:56 a.m. EDT (12:56 GMT) on a mission to deliver a long-awaited physics experiment and spare parts to the International Space Station. REUTERS/Scott Audette (UNITED STATES - Tags: SCI TECH MEDIA ENVIRONMENT)

The space shuttle Endeavour STS-134 waits to lift off from launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida May 16, 2011. Launch pad technicians began filling shuttle Endeavour's fuel tank on Monday for a launch attempt at 8:56 a.m. EDT (12:56 GMT) on a mission to deliver a long-awaited physics experiment and spare parts to the International Space Station. REUTERS/Scott Audette

The space shuttle Endeavour STS-134 lifts off from launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida May 16, 2011. REUTERS/Scott Audette

The space shuttle Endeavour STS-134 lifts off from launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida May 16, 2011. REUTERS/Scott Audette

The space shuttle Endeavour lifts off from the Kennedy Space Center in Cape Canaveral, Florida, May 16, 2011. Endeavour carries a crew of six astronauts on a mission to the International Space Station. REUTERS/Pierre Ducharme

The space shuttle Endeavour STS-134 lifts off from launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida May 16, 2011. REUTERS/Scott Audette

People watch as the space shuttle Endeavour lifts off from the Kennedy Space Center in Cape Canaveral, Florida, May 16, 2011. Endeavour carries a crew of six astronauts on a mission to the International Space Station. REUTERS/Hans Deryk

The space shuttle Endeavour lifts off from the Kennedy Space Center in Cape Canaveral, Florida, May 16, 2011. Endeavour carries a crew of six astronauts on a mission to the International Space Station. REUTERS/Pierre Ducharme

The space shuttle Endeavour lifts off from the Kennedy Space Center in Cape Canaveral, Florida, May 16, 2011. Endeavour carries a crew of six astronauts on a mission to the International Space Station. REUTERS/Joe Skipper

Photographers take pictures as the space shuttle Endeavour lifts off from the Kennedy Space Center in Cape Canaveral, Florida, May 16, 2011. Endeavour carries a crew of six astronauts on a mission to the International Space Station. REUTERS/Pierre Ducharme

The space shuttle Endeavour lifts off from the Kennedy Space Center in Cape Canaveral, Florida, May 16, 2011. Endeavour carries a crew of six astronauts on a mission to the International Space Station. REUTERS/Molly Riley