No, not every galaxy contains a black hole. While many galaxies do have a supermassive black hole at their center, there are also galaxies that do not have a black hole.
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At the center of every galaxy is a supermassive black hole.
At the center of every galaxy is a supermassive black hole.
Not every galaxy has a black hole at its center. While many galaxies do have supermassive black holes at their centers, there are also galaxies that do not have black holes.
Yes, according to current scientific understanding, every black hole is believed to contain a singularity at its core.
Not every galaxy has a black hole at its center, but many galaxies, including our own Milky Way, do have supermassive black holes at their centers.