Scott Joseph Kelly is an engineer, a retired American astronaut, and a retired U.S. Navy captain. A veteran of four space flights, Kelly commanded the International Space Station (ISS) on Expeditions 26, 45, and 46.
From his eyes to his immune system, astronaut Scott Kelly's body sometimes reacted strangely to nearly a year in orbit, at least compared to his Earthbound identical twin brother. (April 12)
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