When you buy through links on our articles, Future and its syndication partners may earn a commission.Scientists have discovered over 100 more gravitational wave events. | Credit: Robert Lea (created with Canva)Our catalog of spacetime ripples “heard” by gravitational wave detectors here on Earth has doubled, scientists say, with newly discovered sources ranging from wobbly black hole mergers to the heaviest black hole collision detected to date.Back in 1915, Albert Einstein predicted that when the most dense and extreme objects in the universe collide, these events would set the very fabric of space and time (united as a 4-dimensional entity called spacetime) ringing. Then, 100 years later, on Sept. 14, 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO) made the first detection of these spacetime ripples — they originated from colliding black holes over 1.3 billion light-years away.AdvertisementAdvertisementSince then, LIGO and its partner gravitational wave detectors Virgo in Italy and KAGRA (Kamioka Gravitational Wave Detector) in Japan have detected a multitude of gravitational waves from colliding black holes, merging neutron stars, and even the odd “mixed merger” between a black hole and a neutron star. The latest data collection from the LIGO-Virgo-KAGRA (LVK) Collaboration reveals the universe is practically humming with gravitational waves from cosmic collisions.Each new gravitational-wave detection allows us to unlock another piece of the universe’s puzzle in ways we couldn’t just a decade ago,” LVK member Lucy Thomas of the California Institute of Technology (Caltech), said in a statement. “It’s incredibly exciting to think about what astrophysical mysteries and surprises we can uncover with future observing runs.”More varietyThe data that comprises this catalog, dubbed the Gravitational-Wave Transient Catalog-4.0 (GWTC-4), includes 128 incredibly distant gravitational wave sources. It was collected during the fourth observational run of these gravitational wave detectors, which was conducted between May 2023 and Jan. 2024.Prior to this, and during the first three observing runs of LIGO, Virgo and KAGRA, scientists had only “heard” 90 potential gravitational wave sources. Excitingly, GWTC-4 could technically have been even larger, as around 170 other gravitational wave detections made by LIGO, Virgo and KAGRA haven’t yet made their way into the catalog.AdvertisementAdvertisement”In the past decade, gravitational wave astronomy has progressed from the first detection to the observation of hundreds of black hole mergers,” LIGO spokesperson Stephen Fairhurst, a professor at Cardiff University in the U.K., said in the statement. “These observations enable us to better understand how black holes form from the collapse of massive stars, probe the cosmological evolution of the universe and provide increasingly rigorous confirmations of the theory of general relativity.”One aspect of GWTC-4 that really stands out is the variety of events that created these signals. Within this catalog are gravitational waves from mergers between the heaviest black hole binaries yet, each about 130 times as massive as the sun, lopsided mergers between black holes with seriously mismatched masses, and black holes that are spinning at incredible speeds of around 40% the speed of light. In these cases, scientists think the extreme characteristics of the black holes involved in these mergers are the result of prior collisions, providing evidence of merger chains that explain how some black holes grow to masses billions of times that of the sun.”This dataset has increased our belief that black holes that collided earlier in the history of the universe could more easily have ha …
