For 340 days, the world looked up to astronaut Scott Kelly as he documented his innovative year aboard the International Space Station (ISS). Kelly shared spectacular images and even some thank-you notes from 240 miles above the earth.
But Kelly’s time in space was anything but fun and games. He was a crucial half of the two subjects of NASA’s Twin Study.
Kelly’s identical twin brother, Mark Kelly, is also an astronaut. The stroke of biological luck gave NASA an identical genealogical structure on Earth to compare with the twin it sent to space.
Over the year, the twins took blood and urine samples as well as performed mental and psychological challenges, providing mental and physical information for NASA to compare and study.
Here I am in 2015 saying peace out to my twin brother @ShuttleCDRKelly before my #YearInSpace. During that year we were studied and gave a lot of blood to see how my body changed compared to his on Earth. Today, @NASA is releasing the results of what they learned. pic.twitter.com/BME5LfK2Ue
— Scott Kelly (@StationCDRKelly) April 11, 2019
Kelly returned to our home planet in March of 2016, having earned his retirement from NASA and now, scientists have released the findings on what a year in space does to the human body and the results are intriguing.
One find was that Scott Kelly’s telomeres—protective layers over the ends of chromosomes in DNA—lengthened. Because telomeres naturally shorten with age, the 55-year-old Kelly’s should have been somewhat dilapidated. They returned to their natural state shortly after he returned to Earth.
Many of Kelly’s genes that were dormant on Earth activated after a stay in space as well, particularly genes that employ proteins to help repair damaged DNA. Some believe this may have been due to higher radiation levels at the International Space Station.
Kelly also showed improvement on mental games and tests once in space, but did poorer on these same tests after his return to Earth, though this may be due to the stress of his busier schedule upon returning and the imminence of his retirement.
Kelly also described what the year of confined space did to his psyche as well.
After three previous space flights, Kelly was no stranger to the heavens, but did confess he missed the smells and seasonal changes of Earth.
People were amazed, not only by the study, but by the twins’ service.
Both of you are pioneers to our final frontier and the ultimate citizens of earth. Sacrificing most of your adult life for the betterment of human kind. Thank you. I hope one day more people understand the importance of your work.
— candycoatedcortex (@tatrbell) April 11, 2019
Yay science! Thank you for all you and your brother have done for space research! A gift to humanity
— Daniela (@danielavmar) April 11, 2019
Huge sacrifice for science @StationCDRKelly ! Really hope you are regaining your health!
— Soren C Stirling (@SorenStirling) April 11, 2019
And, mostly, people were grateful.
Thank you for your service to science!
— Rev. Robert R. Ballecer, SJ (@padresj) April 11, 2019
Thank you for your brave actions! Human kind appreciate it for all eternity.
— Juanu Haedo (@JuanuMusic) April 11, 2019
Brilliant stuff. I'm looking forward to seeing what has been learned. Thank you for all of the hard work and sacrificing, Scott. It'll go down in history without any shadow of a doubt.
— Ruairi (@RedKingLFC) April 11, 2019
We join the chorus of gratitude as well.