AI Summary

Fast radio bursts (FRBs) are intense, millisecond‑long flashes of radio light that traverse billions of light‑years before reaching Earth, passing through intergalactic matter that disperses their signals. Their origins remain uncertain, though magnetars—highly magnetized dead stars—are a leading hypothesis. Because the amount of dispersion depends on the density of the intervening “fog” of matter, FRBs can serve as probes of that material, potentially allowing researchers to separate the effects of galactic feedback from those of dark matter.

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