Audi introduced its concept car Audi AI: Trail at the IAA 2019. The car is special because it combines futuristic design with autonomous driving, electric mobility.
The team of researchers from the University of Leicester (UK) and Monash University in
Australia investigated how some black holes grow so fast that they are billions of times heavier than the sun. Professor Andrew King from the Department of Physics and Astronomy, University of Leicester, said that almost every galaxy has an enormously massive black hole in its center. Our own galaxy, the Milky Way, has one about four million times heavier than the sun. But some galaxies have black holes a thousand times heavier still. Scientists know they grew very quickly after the Big Bang. Black holes grow by sucking in gas. This forms a disc around the hole and spirals in, but usually so slowly that the holes could not have grown to these huge masses in the entire age of the universe. Chris Nixon, King and their colleague Daniel Price in Australia made a computer simulation of two gas discs orbiting a black hole at different angles. After a short time the discs spread and collide, and large amounts of gas fall into the hole. According to their calculations black holes can grow 1,000 times faster when this happens. As said King if two guys ride motorbikes on a Wall of Death and they collide, they lose the centrifugal force holding them to the walls and fall. The same thing happens to the gas in these discs, and it falls in towards the hole. This may explain how these black holes got so big so fast. Researchers don’t know exactly how gas flows inside galaxies in the early universe but they think it is very promising that if the flows are chaotic it is very easy for the black hole to feed. The research will be published in the Monthly Notices of the Royal Astronomical Society.
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