Mark Kelly checks out with the experiment's principal investigator Prof. Samuel Ting.

In the Space Station Processing Facility at NASA's Kennedy Space Center in Florida, STS-134 Commander Mark Kelly, front left, checks out the Alpha Magnetic Spectrometer-2 (AMS) with the experiment's principal investigator, Prof. Samuel Ting. Kelly and his five crewmates are at Kennedy participating in the Crew Equipment Interface Test (CEIT), which gives them an opportunity for hands-on training with tools they'll be using in space and familiarization of the payload they'll be delivering to the International Space Station.

Space shuttle Endeavour is targeted to launch on the STS-134 mission Feb. 27, 2011. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Cory Huston