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View all search resultsThe researchers said the black hole is roughly three times the mass of our sun, testing the lower limits of size for these extraordinarily dense objects that possess gravitational pulls so strong not even light can escape. A luminous star called a red giant orbits with the black hole in a so-called binary star system named V723 Mon.
There are two well-known sizes of black hole -- at one end, so-called stellar-class ones which are typically three to ten times the mass of our Sun -- and at the other, supermassive ones, found at the centre of most galaxies, including the Milky Way, which are millions to billions times heavier.
Researchers said on Thursday that new observations of the Cygnus X-1 black hole, orbiting in a stellar marriage with a large and luminous star, showed it is 21 times our sun's mass, about 50 percent more massive than previously believed.
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