Getting the #Sentinel3 B Earth observation satellite ready for its big day – launch is set for 25 April at 17:57 GMT (19:57 CEST).
Follow the countdown with @ESA_EO: https://t.co/5vl84jyEa7 pic.twitter.com/Fy8ZeZ7cAb— ESA (@esa) April 20, 2018
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