This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
noordung potocnik space station concepts art spacestationconceptsart portrait people blackandwhite monochrome black and white Hermann Potocnik also known as Herman Noordung was an engineer in the Austrian army. Noordung wrote Das Problem der Befahrung des Weltraums The Problem of Space TravelThe Rocket Motor an early work on spaceflight.