When a black hole and a neutron star merge ( news.ycombinator.com )
Or directly, news item link: https://www.mpg.de/21778967/0404-grav-mysterious-object-in-the-gap-152520-x
Or directly, news item link: https://www.mpg.de/21778967/0404-grav-mysterious-object-in-the-gap-152520-x