QUANTA | To Make Two Black Holes Collide, Try Three

A photo illustration of three black holes on a starry sky background.
A third black hole may help accelerate the collision of two others. (Credit: Photo illustration by Lucy Reading-Ikkanda/Quanta Magazine. Image Source: Pexels)

Quanta Magazine

Also published in Nautilus Magazine

August 2019

How do black holes merge and make gravitational waves? Maybe with a little help from their friends.