What happened in the 1880s?
๐ Concept of Rocketry Proposed by Konstantin Tsiolkovsky (1883): Foundations of astronautics and space exploration.
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Further Reading
Rocket History - 20th Century and Beyond (nasa.gov)
Konstantin Tsiolkovsky - Wikipedia (wikipedia.org)
Konstantin Tsiolkovsky: Russian Father of Rocketry - Space.com (space.com)
Konstantin E. Tsiolkovsky - New Mexico Museum of Space History (nmspacemuseum.org)
Brief History of Rockets - NASA Glenn Research Center (nasa.gov)
The Foundations of the Space Age (astronautix.com)
Konstantin Tsiolkovsky (tsiolkovsky.org)
Konstantin Tsiolkovsky Slept Here - Smithsonian Magazine (smithsonianmag.com)
Konstantin Eduardovich Tsiolkovsky: Humanity's spacefaring future ... (spacefaringamerica.com)
Visionaries of Human Space Exploration | SpringerLink (springer.com)