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The black holes are so dense and their gravitational force is so strong that no form of radiation can escape them – not even light.
They act as intense sources of gravity that suck dust and gases around them.
Their intense gravitational attraction is thought to be what stars of galaxies gravitate around.
How they are trained is still poorly understood.
Supermassive black holes are incredibly dense areas in the center of galaxies with masses that can be billions of times larger than the sun. They cause hollows in space-time (artist's impression) and even light can not escape their gravitational appeal.
Astronomers believe that they can form when a large cloud of gas up to 100,000 times larger than the sun collapses into a black hole.
Many of these black hole seeds then fuse to form much larger supermassive black holes, which are at the center of all known massive galaxies.
Alternatively, a supermassive black hole seed can come from a giant star, about 100 times the mass of the sun, which eventually forms a black hole after a fuel breakdown and a collapse.
When these giant stars die, they also surrender in "supernova", a huge explosion that expels matter from outer layers of the star into deep space.
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