The heart of the galaxy is a supermassive black hole.
This is different from the wandering black hole humanity once encountered; that wandering black hole could at most attract a few nearby star systems, but this supermassive black hole can attract an entire galaxy, with a magnitude at least a million times greater.
According to scientists and records from Fourth Level Cosmic Civilizations, such supermassive black holes generally originate from the early stages of the universe's birth. They could only form when there was a massive concentration of matter and energy, and before matter had begun to downgrade into dark matter.
