In this Sept. 29, 2014 photo made available by NASA, James Webb Space Telescope Optical Engineer Larkin Carey examines two test mirror segments on a prototype at the Goddard Space Flight Center's giant clean room in Greenbelt, Md. Webb will attempt to look back in time 13.7 billion years, a mere 100 million years after the universe-forming Big Bang as the original stars were forming. (Chris Gunn/NASA via AP)
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