Prof. Dr. Ulrich Hans Walter (born February 9, 1954) is a German physicist/engineer and a former DFVLR astronaut. In 1993, he flew on board the Space Shuttle Columbia on mission STS-55 (Spacelab D-2) as a Payload Specialist. He spent 9 days, 23 hours, and 40 minutes in space.
STS-55 (Space Transportation System 55), or D-2 was the 55th overall flight of the US Space Shuttle and the 14th flight of Shuttle Columbia. This flight was a multinational Spacelab flight involving 88 experiments from eleven different nations. The experiments ranged from biology sciences to simple earth observations.Low Earth Orbit
The German Aerospace Center is Germany's Center for aerospace, energy, and transportation research. Their main work is as a contributor to the ESA. They have done work both in tandem with the US on Space Shuttle and the ISS, and also with other European Nations on missions like Space Lab and Mars Express.