Answer
Noordung, the pseudonym of Herman Potočnik, a Slovenian engineer, and space travel pioneer, is most remembered today for having authored ‘The Problem of Space Travel – The Rocket Motor’, a visionary publication outlining space exploration through liquid-propellant rockets. Originally printed in 1928, Noordung’s work detailed ideas, including the use of orbiting space stations, the geostationary orbit and solar power, which would all become commonplace concepts in space exploration.