Ivan Sekretarev
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In this photo made on Monday, Oct. 2, 2017, a guide tells students about a mock-up of the First Earth Sputnik in the Museum of Cosmonautics in Moscow, Russia. The launch of Sputnik 60 years ago opened the space era and became a major triumph for the Soviet Union, showcasing its military might and technological edge. (AP Photo/Ivan Sekretarev)