Scott Kelly is a retired American astronaut and U.S. Navy captain. He is best known for his year-long mission aboard the International Space Station (ISS), where he conducted various scientific experiments and studies on the effects of long-duration spaceflight on the human body. Kelly has spent a total of 520 days in space, making him one of the most experienced astronauts in history. Born on February 21, 1964, in Orange, New Jersey, Kelly earned a degree in electrical engineering from the New Jersey Institute of Technology. He was selected as a NASA astronaut in 1996 and has participated in multiple spaceflights, contributing significantly to space exploration and research.