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Live coverage of the countdown and launch of a Proton rocket and the Inmarsat 5 F3 mobile communications satellite. Text updates will appear automatically below; there is no need to reload the page. Follow us on Twitter.
Live coverage: Proton blasts off on return-to-flight mission
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If you would like to see more articles like this please support our coverage of the space program by becoming a Spaceflight Now Member. If everyone who enjoys our website helps fund it, we can expand and improve our coverage further.
