#OTD 10 December 1999 launch of #ESA's #XMM-Newton x-ray telescope on an #Ariane 5 rocket @ESA_XMM @esascience https://t.co/oiIxKy7XMV pic.twitter.com/VW9xoqChLe
— ESA space history (@ESA_History) December 9, 2016
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