After more than two decades, an international research team has identified a galactic mystery source of gamma rays: a heavy neutron star with a very low mass companion orbiting it.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/mysteryofunu.jpg)
Source:
https://phys.org/news/2020-10-mystery-unusual-neutron-star-revealed.html