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The concept that black holes may exist that are smaller than stellar mass was introduced in 1971 by Stephen Hawking. [2] It is possible that such black holes were created in the high-density environment of the early Universe (or Big Bang), or possibly through subsequent phase transitions (referred to as primordial black holes).
Scientists have discovered what may be the smallest-known black hole in the Milky Way galaxy and the closest to our solar system - an object so curious that they nicknamed it 'the Unicorn.' The ...
OJ 287 core black holes — a BL Lac object with a candidate binary supermassive black hole core system [23] PG 1302-102 – the first binary-cored quasar — a pair of supermassive black holes at the core of this quasar [24] [25] SDSS J120136.02+300305.5 core black holes — a pair of supermassive black holes at the centre of this galaxy [26]
IGR J17091 is a stellar mass black hole with a mass between 3 and 10 M ☉. It is a binary system in which a star orbits the black hole. [4] Its small size may make it a candidate for the smallest black hole discovered. [5] However, as of 2017 its mass was described as "unknown". [6]
The mass of the black hole in GRO J0422+32 falls in the range 3.66 to 4.97 solar masses. [6] This is the smallest yet found for any stellar black hole, and near the theoretical upper mass limit (~2.7 M ☉) for a neutron star. Further analysis in 2012 calculated a mass of 2.1 M ☉, which raises questions as to what the object actually is. [7]
SEE ALSO: Most of the universe may be trapped inside of ancient black holes. DON'T MISS: Stephen Hawking says escape from a black hole is possible — kind of. Show comments. Advertisement ...
List of most massive black holes Host or black hole name Mass (M ☉) Notes (Maximal Theoretical Limit) 2.7 × 10 11: This is the maximum mass of a black hole that models predict, at least for luminous accreting SMBHs. At around 10 10 M ☉, effects of both intense radiation and star formation in the accretion disc slow down black hole growth.
Given the universe is 13.7 billion years old, that puts the age of this black hole at 13.2 billion years. Even more astounding to scientists, this black hole is a whopper — 10 times bigger than ...