A black hole with a staggering mass equivalent to 36 billion suns has been identified 5 billion light-years from Earth at the core of the “cosmic horseshoe galaxy.” For context, Sagittarius A*, the black hole at the center of our Milky Way, weighs 4.15 million solar masses. This newly detected behemoth ranks among the top 10 largest black holes ever observed.
The discovery, led by Brazil’s Federal University of Rio Grande do Sul and published in *Monthly Notices of the Royal Astronomical Society*, confirms astronomers’ long-held suspicions about a black hole anchoring this distant galaxy. Researchers under Carlos Melo-Carneiro verified its existence using the “Einstein ring” effect—a phenomenon where the galaxy acts as a gravitational lens, warping light from a background galaxy into a horseshoe-shaped ring.
Detecting this dormant black hole proved exceptionally challenging, as its presence isn’t betrayed by typical activity like X-ray emissions. “Its identification relied entirely on its immense gravitational pull and its impact on the surrounding environment,” explained Melo-Carneiro, citing stars hurtling at 400 kilometers per second under the black hole’s influence. “What’s particularly thrilling,” he added, “is that this method lets us detect and measure hidden ultramassive black holes across the universe—even when they’re completely silent.”
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