Available with English translation at: https://t.co/T5qoTMocMx #Principia https://t.co/KWy1t3OzVR
— ESA (@esa) November 23, 2016
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Available with English translation at: https://t.co/T5qoTMocMx #Principia https://t.co/KWy1t3OzVR
— ESA (@esa) November 23, 2016