How Big Are the Biggest Black Holes?

How Big Are the Biggest Black Holes?

This animation shows 10 supersized black holes that occupy center stage in their host galaxies, including the Milky Way and M87, scaled by the sizes of their shadows.
NASA/Goddard Space Flight Center Conceptual Image Lab
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    Black holes are formed when massive stars die. The intense gravitational force that they exert allows nothing to escape.