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 fly with him on STS-9, 1st flight of ESA Spacelab. It’s very sad that we lost him. Dear friend RIP.” pic.twitter.com/0k7P7eIp5Z

— ESA (@esa) January 9, 2018