Astronomers have spent the past dozen years hunting for fast radio bursts (FRBs) – flashes of radio waves that come from outer space and last just milliseconds. And after a dozen years of work we still don’t know exactly what causes them, only that it must be something very powerful, as they’ve clearly travelled a long way (billions of light-years).
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2019/howweclosedi.jpg)
Source:
https://phys.org/news/2019-06-fast-radio-galaxy.html