At the center of many large galaxies hides a supermassive black hole that is millions to billions of times more massive than the Sun. Interestingly, the mass of the black hole is roughly proportional to the mass of the central region (bulge) of the galaxy in the nearby Universe.
At first glance, this may seem obvious, but it is actually very strange. The reason is that the sizes of galaxies and black holes differ by about ten orders of magnitude. Based on this proportional relationship between the masses of two objects that are so different in size, astronomers believe that galaxies and black holes grew and evolved together (coevolution) through some kind of physical interaction.
credits to: @spaceinnutshell
Caption by: @daily.universes
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