A new study by a group of researchers at the University of Birmingham has found that collisions of supermassive black holes may be simultaneously observable in both gravitational waves and X-rays at the beginning of the next decade.
![](https://scx1.b-cdn.net/csz/news/tmb/2019/4-blackhole.jpg)
Source:
https://phys.org/news/2020-01-x-rays-gravitational-combine-illuminate-massive.html