Lift off for #Galileo 15-18 aboard #Ariane5 #VA233 at 14:06 CET pic.twitter.com/CTjmMn3l22 — ESA (@esa) November 17, 2016

@OneGiantRead @Thom_astro we will! — ESA (@esa) November 17, 2016

An important first for #Ariane5 tonight on Flight #VA233! Share your #Galileo knowledge using #GoAriane5! @EU_Commission @EU_Growth @ESA pic.twitter.com/RwOYSjpFuO — Arianespace (@Arianespace) November 17, 2016

LIVE now: Watch the launch of #Galileo 15-18 aboard #Ariane5 #VA233 #GoAriane5 https://t.co/T6JkXs8hjA pic.twitter.com/swhUEy3Qys — ESA (@esa) November 17, 2016

#SoyuzMS03 launch today for @Thom_astro, @AstroPeggy & Oleg. What have they been doing in the last few days? #blog https://t.co/oic3rdOM1q pic.twitter.com/4p98bDgNuD — Human Spaceflight (@esaspaceflight) November 17, 2016

The Rhine-Main area in #Germany as seen by #Sentinel2 is @esaoperations #IOTW – includes #Darmstadt, home to ESOC https://t.co/k7l4VT8SRx pic.twitter.com/X4zujkO74M — ESA (@esa) November 17, 2016

Mapping the Early November 2016 Bushfire Burnt Areas in #Sydney #Newcastle Region Australia with #Sentinel2 imagery https://t.co/mEcGpUjTdl pic.twitter.com/UdSnSSoLlJ — BigData Earth (@BigDataEarth) November 17, 2016

Good luck from all at ESA to @Thom_astro who is set for his first spaceflight today! #AllezThomas #Proxima https://t.co/BBeJHquBfv — ESA (@esa) November 17, 2016

Good luck with your launch tonight @Thom_astro! Another one to watch today on @esa TV at 19:30 https://t.co/LaZYPvLGUM We'll be watching 🙂 — UK Space Agency (@spacegovuk) November 17, 2016

Today #Ariane5 will launch 4 #Galileo sats for the first time. Video update on status of Europe's Galileo system https://t.co/LLxK3K9PPk — ESA (@esa) November 17, 2016