Astronaut Leroy Chiao, Expedition 10 commander and NASA ISS science officer, wearing a Russian Orlan spacesuit, participates in the first of two sessions of extravehicular activities (EVA) performed by the Expedition 10 crew during their six-month mission. Chiao and cosmonaut Salizhan S. Sharipov (out of frame), flight engineer representing Russia's Federal Space Agency, spent 5 ½ hours outside the International Space Station (ISS) installing a work platform, cables and robotic and scientific experiments on the exterior of the Zvezda Service Module. Station solar array panels are visible near Chiao. Earth’s horizon and the blackness of space provided the backdrop for the image.