Black holes as they are most widely understood require general relativity's concept of a curved spacetime, since their most striking properties rely on a distortion of the geometry of the space surrounding them.
Supermassive fl holes containing millions to billions of solar masses could also form wherever a large number of stars are packed in a relatively small region of space, or by large amounts of mass falling into a "seed" fl hole, or by repeated fusion of smaller fl holes.
Though the details are still not clear, it seems that the growth of the fl hole is intimately related to the growth of the spheroidal component — an elliptical galaxy, or the bulge of a spiral galaxy — in which it lives.
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