Black holes are incredibly massive but cover only a small region. Because of the relation between mass and gravity, this means they have an extremely powerful gravitational force. Virtually nothing can escape from them under classical physics, even light is deceived by a black hole.
Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. After a black hole has developed, it continues to grow by absorbing mass from its surroundings.
Such a strong pull creates an observational dilemma when it comes to black holes scientists can't "see" them the way they can see stars and other objects in space. Instead, scientists must rely on the radiation that is emitted as dust and gas are drawn into the dense creatures. Supermassive black holes, lying in the centre of a galaxy, may find themselves shrouded by the dust and gas thick around them, which can block the tell-tale emissions.
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