HOW THEY FORM

ilms often portray black holes as giant cosmic vacuum cleaners, relentlessly sucking in material until there’s nothing left. If that was how real black holes worked, there would be no mystery as to where the supermassive kind came from: once an ‘ordinary’ black hole had formed from stellar collapse, it would simply grow and grow until it reached enormous size. But real black holes don’t suck matter in like this; they merely attract it with the same law of gravity as a normal object of the same mass. Their exceptional nature