Question

Why does everything in our galaxy orbit the supermassive black hole at the center?​

Answer 1

Explanation:

The black holes sank to the center of gravity, the heart of their host galaxy. Since galaxies evolve by merging and colliding with one another, collisions between galaxies will result in supermassive black hole pairs - the key part of this story. The black holes then collide and grow in size as well.

Answer 2

Explanation:

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Strictly speaking, everything in our galaxy does not orbit the supermassive black hole at the center. Everything in the galaxy orbits the center of mass of the galaxy. The supermassive black hole just happens to be at the center. If the black hole at the center were removed, the galactic orbits of almost all objects in the galaxy would not change (except for the few stars that are very close to the black hole). Our galaxy contains a lot of mass, which includes stars, gas, planets, and dark matter.