After spending 340 days on the International Space Station (ISS) in 2015 and 2016, astronaut Scott Kelly might have actually gotten younger. Kelly, who has an identical twin brother (and a retired astronaut) Mark, was a guinea pig of sorts during his time in space. Scientists used this rare opportunity to study the two brothers: one in space, and one back on earth. What they found was a shock. Telomeres reside at the ends of each chromosome and aid in the repair of damaged DNA. Throughout your life, telomeres fluctuate in length, but as we age they always get shorter. Scott’s…
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