In 1931, Auguste Piccard and Paul Kipfer ascended in a hydrogen balloon to an altitude of 15,800 m (52,000 ft), higher than anyone before them, becoming the first humans to witness the curvature of the Earth.
— Fermat's Library (@fermatslibrary) October 9, 2025
They studied cosmic rays and were also the first humans to enter the… pic.twitter.com/YITVA3KczH
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