The Younger Dryas impact hypothesis says a cosmic event may have helped trigger the abrupt cooling around 12,900 years ago, along with fires, ecological disruption, and other knock-on effects. Some papers report impact-like markers, such as unusual particles and melt materials, and argue they fit that story.
The problem is that other researchers have challenged the timing, the reproducibility, and the strength of the evidence. So the short answer is not proven and not debunked. It is a debated hypothesis with some supporting signals, but not a settled explanation for the Younger Dryas.
In other words, the idea is scientifically interesting, but the evidence has not converged on one clean conclusion.
That is why you still see disagreement in the literature: the signal is intriguing, but the chain from evidence to cause is not locked down.
For a page like this, the useful answer is the status of the debate, not a fake yes-or-no certainty.
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