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Astronaut Scott Kelly returns to Earth next week after nearly a year in orbit aboard the International Space Station. Kelly told reporters in a video news conference from orbit this week, "I could go another 100 days. I could go another year if I had to. It would just depend on what I was doing and if it made sense, although I do look forward to getting home here next week." Kelly took questions on Day 335 of what is already NASA's longest single spaceflight. By the time he checks out and rides a Russian capsule to a landing in Kazakhstan, his mission will have lasted 340 days.