 OHB-System, a manufacturer of medium-sized space-flight satellites, was founded in 1958.The University of Bremen, founded in 1971, is one of 11 institutions classed as an "Elite university" in Germany, and teaches approximately 23,500 people from 126 countries.Bremen lies on both sides of the River Weser, about upstream of its estuary on the North Sea and its transition to the Outer Weser by Bremerhaven.