Expedition 18 was a mission to the International Space Station (ISS) that took place from October 2008 to April 2009. It was part of the NASA program and involved a crew of six astronauts, including Michael Fincke and Yuri Lonchakov. The mission focused on maintaining and expanding the ISS, conducting scientific research, and testing new technologies. During Expedition 18, the crew performed various tasks, such as spacewalks to install new equipment and conducting experiments in fields like biology and physics. The mission contributed to the ongoing development of the ISS and helped prepare for future expeditions and research initiatives.