Reddit: We are experts working on The Twins Study to learn how NASA spaceflight affects the human body. Ask Us Anything!

The Twins Study encompassed 10 separate investigators (including CSU's Susan Bailey) who coordinated and shared all data and analysis as one large, integrated research team. Retired NASA astronaut Scott Kelly spent 340 days in low-Earth orbit aboard the International Space Station while retired NASA astronaut Mark Kelly, his identical twin, remained on Earth.

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