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Two types of black holes are found in the universe: stellar-mass black holes and supermassive black holes.
But others, such as the Milky Way, would still have formed a supermassive black hole despite never being a quasar.
An international team of astronomers have provided compelling evidence that we have a supermassive black hole at the centre of our galaxy.
Although astronomers are surprised to find a blue disk of stars swirling around a supermassive black hole, they also say the puzzling architecture may not be that unusual.
This discovery suggests that surveys of powerful supermassive black holes have so far underestimated their numbers by at least a factor of two, and possibly by up to a factor of five.
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