Expedition 61 was a mission to the International Space Station (ISS) that launched on November 11, 2019. The crew included astronauts from NASA, Roscosmos, and ESA, and their primary objectives were to conduct scientific research and perform maintenance on the ISS. During the mission, the crew carried out over 200 experiments in various fields, including biology, physics, and technology. They also participated in spacewalks to upgrade the station's systems and enhance its capabilities for future missions. Expedition 61 concluded on April 17, 2020, when the crew safely returned to Earth.