I’m not certain on theories for other galaxies, but scientists believe there to be a supermassive black hole at the Galatic Center of the Milky Way. They think there is a massive black hole because the center can’t be studied using visible, ultra-violet or soft-xray lights.
For there to be enough gravitational pull around which our galaxy can rotate, the center must be a supermassive black hole or something of the sort. Black holes are known to have gravitational forces from which nothing can escape – even light, which is said to be the fastest moving entity in our universe. It would make sense that our galaxy should rotate around something that powerful, but we cannot see it directly with our current technologies.
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