Expedition 15 was a mission to the International Space Station (ISS) that took place from April to October 2007. The crew consisted of six members, including NASA astronaut Michael Lopez-Alegria, who served as the commander. The mission focused on various scientific experiments and maintenance tasks aboard the ISS. During Expedition 15, the crew conducted over 30 experiments in fields such as biology, physics, and technology. They also welcomed the arrival of the European Space Agency's Automated Transfer Vehicle, which delivered supplies and equipment to support ongoing research and daily operations on the station.