The study posits that the center of the Milky Way contains hundreds of black holes paired with stars and 10,000 isolated black holes. (businessinsider.com)
The most common explanation for black hole pairs with such «spin misalignment» is that they did not form from the binary evolution of isolated twin stars. (scientificamerican.com)
But some researchers question whether the clusters can produce as many black hole pairs as LIGO seems to see. (sciencemag.org)