Scott Kelly Early Life and NASA Career
Scott Kelly is a retired NASA astronaut, engineer, and naval aviator best known for spending 340 days aboard the International Space Station. His wiki profile highlights his role in long-duration spaceflight research and his service as a commander on multiple missions. He was selected by NASA in 1996 and has logged over 520 days in space across four missions, including Expeditions 25/26 and 26/27. He is also the identical twin brother of astronaut Mark Kelly, a former U.S. senator and space shuttle commander NASA Astronaut Bio: Scott Kelly.
Kelly's career path includes graduation from the U.S. Merchant Marine Academy in 1987 and service as a naval aviator flying F-14 Tomcats. He attended the U.S. Naval Test Pilot School and later worked as a research pilot at NASA's Johnson Space Center before his astronaut selection. His missions contributed to ISS assembly, maintenance, and science operations, with his longest flight supporting studies on human adaptation to microgravity Scott Kelly: NASA's Record-Setting Astronaut.
Year in Space Mission and the NASA Twin Study
340-Day ISS Mission Overview
From March 2015 to March 2016, Kelly served as commander of Expedition 43/44 and 44/45, spending 340 days on the ISS. This mission was designed to study the physiological and psychological effects of long-duration spaceflight, with Scott and Mark Kelly serving as the twin subjects in the NASA Twins Study. The research examined changes in gene expression, bone density, muscle mass, cognitive performance, and telomere length during and after extended microgravity exposure NASA Twins Study Overview.
Key Scientific Findings
NASA's published results indicate that Scott Kelly experienced temporary changes in gene expression, immune system response, and body composition during his year in space. Most measures returned to near pre-flight levels within six months of his return to Earth, though some telomere dynamics and cognitive performance changes persisted longer. The Twins Study has become a foundational dataset for planning future long-duration missions, including potential crewed flights to Mars NASA Twins Study Results.
Post-NASA Career, Public Profile, and Net Worth
Current Roles and Public Engagement
After retiring from NASA in 2016, Scott Kelly has focused on public speaking, advocacy for STEM education, and authorship. He published his memoir "Endurance: A Year in Space, A Lifetime of Discovery" in 2017, detailing his experiences in orbit and the challenges of long-duration missions. He continues to serve as a consultant and speaker on space exploration, leadership, and human performance under extreme conditions.
Financial Profile and Public Estimates
Public sources estimate Scott Kelly's net worth in the range of several million dollars, derived from his NASA salary, book royalties, speaking engagements, and media appearances. His career as a military officer, test pilot, and astronaut provided a stable foundation, and his post-NASA work has expanded his visibility in both the public and private sectors. Exact figures are not officially disclosed, but his financial profile aligns with that of a high-profile federal astronaut and published author.