Material falling into a black hole casts X-rays out into space—and now astronomers have used the echoes of this radiation to map the dynamic behavior and surroundings of a black hole itself.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/astronomersu.jpg)
Source:
https://phys.org/news/2020-01-astronomers-cosmic-echolocation-black-hole.html