ESA’s X-ray space telescope XMM-Newton has detected never-before-seen periodic flares of X-ray radiation coming from a distant galaxy that could help explain some enigmatic behaviours of active black holes.
![](https://scx1.b-cdn.net/csz/news/tmb/2019/unexpectedpe.gif)
Source:
https://phys.org/news/2019-09-unexpected-periodic-flares-black-hole.html