Astronauts Chris Cassidy and Luca Parmitano
NASA astronaut Chris Cassidy (right) and European Space Agency astronaut Luca Parmitano, both Expedition 36 flight engineers, are pictured in the Quest airlock of the International Space Station as they prepare for the start of a session of extravehicular activity (EVA). Cassidy and Parmitano are wearing Extravehicular Mobility Unit (EMU) spacesuits.