Everything Everywhere Daily · Monday, June 29, 2026
Astronaut Scott Kelly's 384-day mission on the ISS provided valuable data, with NASA studies on him and his twin brother revealing changes in gene expression, immune response, bone metabolism, and cardiovascular function. While many changes returned to baseline after his return, the long-term effects are still being studied.
“Astronaut Scott Kelly spent 384 days aboard the International Space Station in 2015 and 2016.”
“They found changes involving gene expression, immune response, bone metabolism, body mass and cardiovascular function. Although many of these returned towards baseline after he came home.”