Hermann Oberth Quotes
The rockets... can be built so powerfully that they could be capable of carrying a man aloft.
Oberth, Hermann. Die Rakete zu den Planetenräumen. R. Oldenbourg, 1923, p. 7.
Before the first airplane had flown, Tsiolkovsky had worked out the mathematics and physics to put a rocket powered scientific probe into orbit.
NASA has now sent probes to every planet and dwarf planet. It took less than a century.
This was 50 years before the invention of the airplane, and more than 100 years before space travel.
Hermann Julius Oberth was an Austro-Hungarian-born German physicist and engineer. He is considered one of the founding fathers of rocketry and astronautics, along with the French Robert Esnault-Pelterie, the Russian Konstantin Tsiolkovsky, and the American Robert Goddard.