A cosmic impact can be established from its proxies alone without a crater — that is exactly how the dinosaur extinction was first argued.

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• His case does not rest on the impact hypothesis: what is load-bearing is that the Younger Dryas happened at all, whatever triggered it. GHGraham Hancock16 Oct 2024similar wording
• Dinosaurs were doing fine right up to the impact; there is no good reason to think they were already in terminal decline. DHDave Hone4 Sept 2025similar wording
• Science explains the Younger Dryas freeze by the Gulf Stream shutting down but never explains what shut it down, and a comet impact is the elegant answer. GHGraham Hancock16 Oct 2024similar wording
• Some dinosaurs almost certainly survived the impact for hundreds of thousands of years in isolated pockets, and we will almost certainly never find them. DHDave Hone4 Sept 2025similar wording
• The Younger Dryas was triggered not by one impact but by hundreds of airbursts from a fragmenting comet whose debris stream the Earth still crosses twice a year. GHGraham Hancock16 Oct 2024similar wording

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