A look at the supermassive black holes that lurk at the heart of most galaxies.
Although this tiny galaxy is only about 20 million solar masses in total, its central black hole is proportionately huge, at around 3 million solar masses.This huge elliptical galaxy – a cosmic neighbour at just 13 million light-years – is a powerful radio emitter thanks to the 55 million solar mass black hole at its center.The product of two merging galaxies, NGC 7727 still retains two separate supermassive black holes – of 154 and 6.
When surrounded by a swirling"accretion disk" of rapidly rotating gas and dust, matter is constantly spiralling down into the black hole. In the process, it releases enormous amounts of energy, sometimes even outshining the rest of the galaxy. succeeded in photographing one such galaxy — Messier 87 — producing a direct image of the accretion disc. The ominous shadow of the galaxy’s 6.
Their exceptional nature comes from the fact that they’re super-condensed and the force of gravity increases as distance decreases. So it’s possible for an orbiting object to stray into a region where gravity becomes incredibly strong. At larger distances, however, a black hole’s gravity is perfectly normal.
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