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… a study from 1963 suggested that, if detonated 28 miles (45 kilometers) above the surface of the Earth, a 10,000-megaton weapon could set fires over an area 500 miles (800 kilometers) in diameter.
If you prefer to read: https://www.historynewsnetwork.org/article/the-untold-story-of-the-worlds-biggest-nuclear-bom
Big hydrogen bombs :