German inventor and early rocketry theorist who, in a widely reported 1891 lecture in Berlin, proposed using reaction propulsion to launch a crewed vehicle beyond Earth's atmosphere. His speculative designs predate the more rigorous mathematical treatments of Tsiolkovsky and Goddard and mark him as one of the earliest people to publicly argue that spaceflight was physically achievable.
Facts
Defining ContributionOne of the earliest public proponents of reaction propulsion for crewed spaceflight, decades before the field had rigorous mathematics behind it 1 Notable Work1891 Berlin lecture proposing a reaction-propelled space vehicle 1 Sources
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