Expedition 51 was a mission to the International Space Station (ISS) that took place from April to September 2017. It involved a crew of six astronauts and cosmonauts who conducted scientific research and technology demonstrations in microgravity. The mission aimed to advance knowledge in various fields, including biology, physics, and Earth sciences. The crew included members from NASA, Roscosmos, and the European Space Agency. Notable experiments during Expedition 51 included studies on fluid dynamics and the effects of microgravity on human health. The mission contributed to ongoing efforts to prepare for future long-duration space exploration.