"The one-year increment will expand the bounds of how we live and work in space and will increase our knowledge regarding the effects of microgravity on humans as we prepare for future missions beyond low-Earth orbit," said NASA Associate Administrator William Gerstenmaier.
Kelly and Kornienko will begin a two-year training program early next year in the United States, Russia and other partner nations.
Kelly was a backup crew member for the station's Expedition, where Kornienko served as a flight engineer.
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