From one collapsing star, two black holes form and fuse

Over billions of years, small black holes can slowly grow into supermassive black holes by taking on mass from their surroundings, and also by merging with other black holes. But this slow process can't explain how supermassive black holes existing in the early universe would have formed less than one billion years after the Big Bang. New findings help to test a model that solves this problem.

Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/8...