An experiment on @space_station using transparent materials will shed light on how metal casting works in the quest for the perfect #alloy https://t.co/pNoWFLl3Vd pic.twitter.com/w16JoAUtQW — ESA (@esa) January 9, 2018

Good question! there's a great explanation here: https://t.co/kM23oEbs7q — ESA (@esa) January 9, 2018

We'll pass the picture with Hayden on to Ulf Merbold with your message, thanks for sending — ESA (@esa) January 9, 2018

From Ulf Merbold: "In my years as an ESA astronaut, the person I admired most was #JohnYoung. His accomplishments make him unique among space fliers. I had the privilege to […]

Hyperscout: handsized hyperspectral camera to fly on our next #Cubesat https://t.co/DHZ9JdDEzp pic.twitter.com/b0rHVuxpqV — ESA (@esa) January 9, 2018

Need to shake some post-holiday blues off? Tag along on our journey… To #Antartica ❄️ Our own @ESA_EO Tânia Casal is on her way there for a new #CryoVEX campaign: […]

Bright Planetary Nebula NGC 7027 from Hubble: https://t.co/S3HR7ab3oZ by @hubble_space, NASA, @esa ;sProcessing & License:sJudy Schmidt pic.twitter.com/hAqgMO4ySF — Astronomy Picture Of The Day (@apod) January 9, 2018