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3 Astronauts Walk Into NPR ...

Ellen Stofan (from left), chief scientist of NASA, and astronauts Samantha Cristoforetti, Serena Auñón and Cady Coleman. (NPR)
Ellen Stofan (from left), chief scientist of NASA, and astronauts Samantha Cristoforetti, Serena Auñón and Cady Coleman. (NPR)

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