U.S. astronaut Scott Kelly bid farewell to Twitter at the end of his yearlong mission this morning with a sequence of five sunrise photos before he leaves the International Space Station. Kelly has broken the American records for most time consecutively spent in space, and data from his and Russian cosmonaut Mikhail Kornienko's stay will help scientists evaluate the best ways to support humans in space for long journeys, such as a trip to Mars. Amid final preparations to leave with Kornienko and Russian cosmonaut Sergey Volkov, Kelly transferred command of the station to U.S. astronaut Tim Kopra yesterday afternoon.
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