Observed facts
- A burst can release enormous apparent radio power in only a few milliseconds.
- Some sources repeat while others have not been seen again, implying more than one physical population.
- Precise arrival-time delays across radio frequencies reveal the material between the source and Earth.
Leading scientific explanations
- Magnetars and other highly magnetized neutron stars are established sources for at least some bursts.
- Young supernova remnants, compact-object interactions, and environments around active galaxies may contribute to the wider population.
- The full range of progenitors and how bursts turn on and off remain active research questions.
What remains uncertain
“Fast radio burst” describes an observed signal class, not one single engine. New localizations continue to refine the family tree.