On April 25, 2019, the National Science Foundation’s Laser Interferometer Gravitational-Wave Observatory (LIGO) and the European-based Virgo detector registered gravitational waves from what appears likely to be a crash between two neutron stars—the dense remnants of massive stars that previously exploded. One day later, on April 26, the LIGO-Virgo network spotted another candidate source with a potentially interesting twist: it may in fact have resulted from the collision of a neutron star and black hole, an event never before witnessed.
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2017/59d36b0fecc97.jpg)
Source:
https://phys.org/news/2019-05-ligo-virgo-neutron-star-smash-ups.html