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takyon [soylentnews.org] writes:

Black holes are more common than thought [uci.edu], explaining why they can collide and merge, creating detectable gravitational waves:

After conducting a cosmic inventory of sorts to calculate and categorize stellar-remnant black holes, astronomers from the University of California, Irvine have concluded that there are probably tens of millions of the enigmatic, dark objects in the Milky Way – far more than expected.

"We think we've shown that there are as many as 100 million black holes in our galaxy," said UCI chair and professor of physics & astronomy James Bullock, co-author of a research paper on the subject in the current issue of Monthly Notices of the Royal Astronomical Society [oup.com] [open, DOI: 10.1093/mnras/stx1959] [DX [doi.org]].

[...] "We have a pretty good understanding of the overall population of stars in the universe and their mass distribution as they're born, so we can tell how many black holes should have formed with 100 solar masses versus 10 solar masses," Bullock said. "We were able to work out how many big black holes should exist, and it ended up being in the millions – many more than I anticipated." [...] "We show that only 0.1 to 1 percent of the black holes formed have to merge to explain what LIGO saw," [Manoj] Kaplinghat said. "Of course, the black holes have to get close enough to merge in a reasonable time, which is an open problem."

That sucks.

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