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The Tunguska object vaporised almost entirely in the airburst, so Leonid Kulik's 1920s and 1930s expeditions mapped the event not from a crater but from the radial pattern of felled and scorched trees stretching hundreds of square kilometres from the epicentre

The 1908 Tunguska explosion flattened 2,150 square kilometres of Siberian forest without leaving a crater. Leonid Kulik's expeditions reconstructed the event entirely from the radial pattern of felled trees — and a century later, the airburst remains the largest cosmic impact in recorded human history.

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The future of travel beyond Earth.

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