Konstantin Tsiolkovsky quote: The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.

The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.

~ Konstantin Tsiolkovsky ~

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The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.

Picture of Konstantin Tsiolkovsky — Konstantin Tsiolkovsky

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