The rotating service structure RSS protecting space shuttle Endeavour is open in Florida.

The rotating service structure (RSS) protecting space shuttle Endeavour from the elements and providing access to its components is open to allow crews to move the primary payload for the STS-134 mission into the Payload Changeout Room on Launch Pad 39A at NASA's Kennedy Space Center in Florida. The Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 are scheduled to be installed into the shuttle's cargo bay March 25.

Endeavour and its six-member STS-134 crew are targeted to lift off April 19 at 7:48 p.m. EDT to deliver the payload to the International Space Station. This is Endeavour's final scheduled mission. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA