A supermassive black hole is a black hole with a mass equivalent to many millions of stars and therefore very different from the normal black holes. Until recently they were considered as a mere work of fiction, some thought they only existed in active quasars. Now science believes that there is a supermassive black hole at the center of each and every galaxy including our good old milky way (3 billion times the size of our own sun).
Black holes once considered being the most destructive and dangerous forces of universe now turned out to be responsible for the formation of galaxies and therefore life as we know it.
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