Konstantin Tsiolkovsky (1857–1935) was a pioneering Soviet scientist and philosopher widely considered a founding father of modern rocketry.

Despite being nearly deaf and self-educated, he published the Tsiolkovsky rocket equation in 1903, mathematically proving that multi-stage liquid-fueled rockets could escape Earth's gravity.

Driven by the belief that space exploration was humanity's ultimate destiny, he famously noted, "Earth is the cradle of humanity, but one cannot live in a cradle forever."
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