But what if even bigger black holes are out there? Black holes have a size â¦ The ultramassive black hole is located at the heart of Galaxy Holm 15A. TON 618. Is there a limit to black hole size? That title belongs to an ultramassive black hole powering the quasar known as TON 618, which is about 10.4 billion light-years away from Earth. A supermassive black hole (SMBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses (M â), and is theorized to exist in the center of almost all massive galaxies.In some galaxies, there are even binary systems of supermassive black holes, see the OJ 287 system. A new study has posited the possible existence of âstupendously large black holes,â or SLABs, which could be â¦ The mass of the black hole in TON 618 is 66 billion solar masses. The biggest is likely the quasar TON 618 , which harbors a black hole with 66 billion times the Sunâs mass. It was first discovered in 1957 while surveying faint blue stars that do not lie on the Milky Way plane. TON 618 is a hyperluminous quasar located 10.37 billion light-years from Earth. Solar Mass: 6.6×10 10. That makes it one of the biggest black holes ever recorded, as Science Alert points out. As of today, the biggest black hole known to scientists is TON 618, which has a mass of 66 billion solar masses. It is one of the most massive known black hole! There is still no evidence such enormous black holes do exist, as well as no suitable theory on how they could form. Much like stars and planets, black holes also fall into different categories. The largest black hole ever discovered is TON 618 and it has an incredible mass of 66 billion solar masses. Astronomers have now spotted a record-breaking heavyweight black hole at the center of a â¦ TON 618 is a very distant and extremely luminous quasarâtechnically a hyperluminous, broad-absorption-line, radio-loud quasarâlocated near the North Galactic Pole in the constellation Canes Venatici.TON 618 is currently the most massive black hole ever found with a mass of 66 billion M â. The event horizon in TON 618 would be 198 billion kilometers. That distinction goes to the quasar TON 618 -- indirect studies suggest its black hole could be 66 billion times the Sun's mass. As of today, the biggest black hole known to scientists is TON 618, which has a mass of 66 billion solar masses. Even though this black hole is bigger than most, the biggest black hole in the known universe is a lesser object called TON 618. Is ton 618 the biggest black hole? 1. It contains the biggest black hole [known to mankind], weighing 66 billion times the mass of our Sun.