Scott Kelly Study Finds 811 Genes Still Altered 6 Months After 340-Day Space Mission
Updated
Updated · Boy Genius Report · Jun 12
Scott Kelly Study Finds 811 Genes Still Altered 6 Months After 340-Day Space Mission
3 articles · Updated · Boy Genius Report · Jun 12
Summary
811 genes across multiple cell types had not returned to preflight levels six months after Scott Kelly came back from a 340-day stay on the International Space Station.
NASA’s twin study compared Kelly with his identical twin Mark on Earth and found shifts in gene expression, immune activity, telomere length and mental performance tied to long-duration spaceflight.
Scott Kelly also grew taller, lost muscle and showed slower aging markers during the mission; his telomeres lengthened in space before shortening again after landing, a result researchers called unexpected.
Cognitive speed and accuracy declined and remained lower after return, adding to evidence that longer missions may require stronger health safeguards for astronauts.
The 2015-2016 experiment, published in 2019, was the first NASA twin study, and researchers said more subjects are needed to determine whether the effects extend beyond Kelly.
Why did an astronaut's chromosomes seemingly get younger in space, only to age rapidly upon returning to Earth?
If 7% of an astronaut's genes are permanently altered, what does this mean for human colonization beyond Earth?
How will AI-powered digital twins prevent the permanent bodily changes caused by future deep space missions?
Unprecedented Insights from the NASA Twins Study: How 340 Days in Space Changed Scott Kelly’s Body and Mind
Overview
The NASA Twins Study is a landmark investigation that compared the physiological, molecular, and cognitive changes of astronaut Scott Kelly during his 340-day mission in space to his identical twin, Mark, who stayed on Earth. By leveraging their biological similarity, researchers gained critical insights into how long-duration spaceflight affects the human body, such as Scott’s seven percent body mass loss, changes in bone health, and the impact of controlled nutrition and exercise. These findings are essential as humanity plans for future missions to Mars and beyond, helping to identify health risks and develop strategies to keep astronauts safe during extended journeys.