Stock Photo - NASA astronaut Tom Marshburn, Expedition 34 flight engineer, squeezes a water bubble out of his beverage container in the Unity node of the International Space Station. He is wearing a Drager Double Sensor on his forehead which is used on the Circadian Rhythms Experiment. This experiment examines the hypothesis that long-term spaceflights significantly affect the synchronization of the circadian rhythms in humans due to changes of a non-24 hour light-dark cycle.

Stock Photo: NASA astronaut Tom Marshburn, Expedition 34 flight engineer, squeezes a water bubble out of his beverage container in the Unity node of the International Space.

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