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Something you need to know about black holes in galaxies
How black holes become so big in size, our present cosmological understanding related to Black Holes sounds like this:
As galaxies start to grow, collide, and merge over Cosmic Time, they take on large masses of new stars, gas, and dust. Black Holes at the centers of galaxies grow at the same rate, bulging as they merge and eating the newly obtained matter. A rough estimate places the mass of a supermassive Black Hole at about one-thousandth the mass of its home galaxy.
In this scenario, the smallest galaxies in the universe, known as dwarf galaxies, probably haven't undergone many mergers in the past. With a mass only one trillionth of the Milky Way's mass, they would have relatively small, if any, Black Holes.
However, in the last part of the 2000s, astrophysicist Marta Volonteri of Institut d'Astrophysique de Paris at Sorbonne College helped run virtual experiences that followed the advancement of monstrous black holes from birth to now. Even the smallest galaxies could have surprisingly large black holes in those endeavors, almost as soon as they appeared. After billions of years of cosmic evolution, some of those galaxies never expanded or merged with other galaxies.
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