|FDC with Khimki postmark 7 October 1957.|
In the 1920's and 1930's the concept received some attention by pioneers in rocketry and astronautics such as Konstantin Tsiolkovsky of the Soviet Union and Hermann Oberth of Germany. They pointed out some of the advantages that would be obtained by placing rocket-launched satellite payloads into orbit, particularly if men were aboard.
The Russian mathematician Konstantin Tsiolkovsky pointed out the possibilities of rocket flight in the 1890's. Robert Goddard, the American physicist, pioneered the development of the rocket for exploration of the upper atmosphere of the earth in the 1920's and 1930's, and a German group under Hermann Oberth undertook studies on interplanetary travel during the 1920's.