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Scientists confirm another 44 black hole mergers detected by gravitational waves

Scientists have now confirmed that since the first detection of a gravitational wave five years ago they have detected another 44 black hole mergers in the same manner.

A global network of scientists has completed the first major analysis of gravitational wave data, providing exciting insights into some of the most exotic objects in the Universe. “We are announcing the discovery of 44 confirmed black hole mergers, which is a more than a four-fold increase in the number of previously known gravitational-wave signals,” says Shanika Galaudage from Australia’s Monash University, who was part of the research team.

…Their results are described in a trio of papers on the pre-print server arXiv. The first paper describes 39 new detections from the first half of the observing run, primarily of binary black hole systems. This brings the total number of gravitational wave events detected to 47, of which 44 are confidently double black holes, two are confidently double neutron stars, and one is still uncertain.

They think they are detecting more black hole mergers because they are heavier and thus emit bigger and more easily detected waves. They are also finding that the black hole mergers fall into two classes, two holes spinning in the same direction and two holes spinning in opposite or randomly different directions. The former formed together as a binary star system. The latter formed independently and somehow ended up linked up and merging.

Conscious Choice cover

Now available in hardback and paperback as well as ebook!


From the press release: In this ground-breaking new history of early America, historian Robert Zimmerman not only exposes the lie behind The New York Times 1619 Project that falsely claims slavery is central to the history of the United States, he also provides profound lessons about the nature of human societies, lessons important for Americans today as well as for all future settlers on Mars and elsewhere in space.

Conscious Choice: The origins of slavery in America and why it matters today and for our future in outer space, is a riveting page-turning story that documents how slavery slowly became pervasive in the southern British colonies of North America, colonies founded by a people and culture that not only did not allow slavery but in every way were hostile to the practice.  
Conscious Choice does more however. In telling the tragic history of the Virginia colony and the rise of slavery there, Zimmerman lays out the proper path for creating healthy societies in places like the Moon and Mars.


“Zimmerman’s ground-breaking history provides every future generation the basic framework for establishing new societies on other worlds. We would be wise to heed what he says.” —Robert Zubrin, founder of founder of the Mars Society.


All editions are available at Amazon, Barnes & Noble, and all book vendors, with the ebook priced at $5.99 before discount. The ebook can also be purchased direct from my ebook publisher, ebookit, in which case you don't support the big tech companies and I get a bigger cut much sooner.


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  • LocalFluff

    44 new discoveries now released. And 2 neutron star mergers, and determining the relative rotation of the merging partners. That’s pretty good work!

    I heard decades ago about the ridiculous sensitivity that LIGO needs, and thought for myself that “This will never happen.” And ignored it. Then it happened! Lesson learned: When 1,000 published physicists work on the same project, do not assume that it won’t work! They probably don’t waste their time, other than probabilistically (an explanation of my own non-doing much that doesn’t work well with my slave owning girl friend, though, at least probably not.)

    I like that quick paper that appeared as soon as the first gravity wave was detected. Predicting, using the sample of 1, that between 2 and 200 gravity waves will be detected by LIGO per year. And with about 50 delivered, that was a bloody good spot on forecast! My boss wouldn’t have appreciated such a forecast much, but it was evidently rigorous.

  • Edward

    That’s a lot of black hole mergers. 44 in 5 years is around 8 per year. For a universe that is 13 billion years old, that is around 100 billion mergers over the life of the universe.

  • Edward: Actually, astronomers are pretty sure that black holes form approximately one per day, across the entire universe. That’s the rate of gamma ray bursts that has been tracked now for decades, and each burst is thought to be the signal of a black hole birth

  • Chris

    Bob -One per day. Huh.

    Wild speculation time – I wonder if “biological” modeling could be used to predict the occurrence of these based on estimated material available to create such black holes OR estimate the material based on the black hole birth rate. (x(n+1) = Rx(n)(1-x(n0))

    Wild speculation I know

  • Chris

    x(n0) is incorrect. Should be x(n)

  • LocalFluff

    The machine is only turned on for some of the time. In between they polish the mirrors, reweight their balances, measure their strings, dust off their lenses, vacuum clean the tunnels, upgrade their software, convince the lumberjacks around to stop the jacking for a while, and whatever else is involved with maintaining such a strange machine.

    I saw Kip Thorne in one of those Nobel prize interviews saying that he only casually looked at the detection illustrated on his screen as it popped up. Because the Thing was under maintenance then, and he assumed that it was a test signal, because it was so spot on and clear. Until a colleague rushed into his room and said that something wonderful has happened! And Kip Thorne has been working on this since the 1960s. “- Was that it?” He earlier gave name to the Thorne–Zytkow star, a neutron star that orbits inside of a red giant. A prediction then confirmed. And which proves that aliens do have strange 1950s scifi Hollywood names.

    When the on-button is pressed, I think LIGO detects about 50 gravitational waves a year. Although they often release them by the batch as there’s some math to it in the overwhelming noise and scientists, unlike politicians, don’t want to make fools out of themselves when they open their mouths. If they don’t come from merging black holes, it will be the more exciting! Cosmic string fusion, eh?

  • Chris: The modeling would be fun, but utter scientific garbage (as most models are).

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