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Add GW170104 to the chart of black holes with known mass. The extremely energetic merger of two smaller black holes corresponds to the Laser Interferometer Gravitational-wave Observatory’s (LIGO) third detection […]

#Ariane5 launches its heaviest #telecom payload yet https://t.co/UbBU7KhVwE pic.twitter.com/BJYc4OwaVA — ESA (@esa) June 2, 2017

Confirmed: ViaSat-2 has separated from the #Ariane5 launcher #VA237 @ViaSatInc pic.twitter.com/jzJFMsuree — Stéphane Israël (@arianespaceceo) June 2, 2017

ESA astronaut @astrosamantha explains all those important matters https://t.co/TCbaEr3JY0 — ESA (@esa) June 1, 2017

#Ariane5 has lifted off from the Spaceport! The heavy-lift launcher will deploy ViaSat-2 and EUTELSAT 172B over a 41-minute mission pic.twitter.com/ae2r5nSmZs — Arianespace (@Arianespace) June 1, 2017

Lift off of #Ariane5 #VA237 pic.twitter.com/6K1roGFD6R — ESA (@esa) June 1, 2017

NOW: watch launch of #ariane5 on @arianespace Liftoff scheduled for 01:45 CEST https://t.co/mMZTJkKhiI #VA237 pic.twitter.com/CvhyoNNqha — ESA (@esa) June 1, 2017