Liftoff of #Ariane5 with two telecom satellites, Star One-D1 and JCSat-15 pic.twitter.com/SsZ5pXBzLF — ESA (@esa) December 21, 2016

Hard to choose just one! https://t.co/PWArCFZg3M — ESA (@esa) December 21, 2016

Watch the launch of #Ariane5 from Europe's Spaceport https://t.co/mwK85ILwgn pic.twitter.com/YiGJv2l4HX — ESA (@esa) December 21, 2016

@astro_liam @Arianespace 😉 — ESA (@esa) December 21, 2016

Watch #Ariane5 liftoff – one hour to go! https://t.co/NBySf59z9O — ESA (@esa) December 21, 2016

Shake it, blast it, unfurl it – a look at European service module tests for @NASA_Orion done @NASAglenn Plum Brook: https://t.co/XUP6PXtqxf pic.twitter.com/hyh0F49AWy — Human Spaceflight (@esaspaceflight) December 21, 2016

Now serving its first users worldwide, #Galileo #satnav is shaping up to be a powerful tool for scientists:https://t.co/i1svY5uiAO pic.twitter.com/9uoFXvxdZn — ESA Technology (@ESA_Tech) December 21, 2016

#OTD 21 Dec 2011 Exp 30/31 to @Space_Station @astro_andre Kuipers @astro_Pettit & Oleg Kononenko @NASAhistory @esaspaceflight @SRON_Space pic.twitter.com/3kdfCRsN3E — ESA space history (@ESA_History) December 21, 2016

5 yrs ago. Ready for launch Soyuz TMA-3M @astro_Pettit Oleg Kononenko pic.twitter.com/1SY8tLezOc — André Kuipers (@astro_andre) December 21, 2016

The #wintersolstice marks the point at which the Sun is exactly overhead the Tropic of Capricorn. This year it happens today at 10:44 GMT pic.twitter.com/Q8nvFa8Omm — Met Office (@metoffice) December […]