1st triple black hole system discovered in 'happy accident' 

 The first "black hole triple" system, consisting of a black hole hungrily feeding on a companion star orbited by a more distant star, hints at a gentle formation process without supernova explosions. 

https://cdn.mos.cms.futurecdn.net/Vh8HxyxNp4gVVjVraFpYAf.png

https://www.space.com/first-triple-black-hole-system-gentle-formation