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Children are standing at a miniature model of a SMART rover during the "long night of the stars" at the celebration for the 50th birthday of the Esa satellite control center in Darmstadt, Germany, 08 September 2017. Europe's satellites in the space could not be controlled with the center in Darmstadt. The control center Esoc had been opened on 8 September 1967; Esa sent about 80 satellites into space since then. Photo: Arne Dedert/dpa Get premium, high resolution news photos at getty

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24,914 50th Birthday Stock Photos, High-Res Pictures, and Images - Getty Images

24,914 50th Birthday Stock Photos, High-Res Pictures, and Images - Getty Images

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735,001 Birthday Stock Photos, High-Res Pictures, and Images - Getty Images