Russian Extravehicular Activity (EVA) 21A EXPOSE-R

ISS018-E-039227 (10 March 2009) --- One of two Expedition 18 spacewalkers on March 10 provided this close-up image of the Expose-R experiment, reinstalled a short while earlier on the outside of the Russian segment of the International Space Station. The European experiment is equipped with three trays which contain a variety of biological samples.