NASA studies astronaut twins to observe the rigors of space

When you spend nearly a year straight in space, you can expect NASA will want to conduct a good bit of research on you when you return to Earth. The space agency has been doing just that with astronaut Scott Kelly who was in orbit for 340 days. Theres no one better to compare Kelly to than his twin brother and fellow astronaut Mark. NASA collected blood and other biological samples to look for any changes a long spaceflight may cause in the human body.
In total, Scott Kelly ha…
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