Black hole or neutron star? Gravitational wave 'chirps' can tell us what becomes of dying stars 

 The current generation of gravitational wave detectors could "hear" supernovas over 65 million light-years away, helping scientists determine if a dying star creates a black hole or a neutron star. 

https://cdn.mos.cms.futurecdn.net/xjTC8FNRaQ7A43znBWVeyU.png

https://www.space.com/dying-stars-chirps-neutron-star-black-hole