intense gravitational pull caused the galaxy to form around the black hole
Not all galaxies, but it is believed that the majority of galaxies have central black holes.
It's not "galaxy stars", but galaxies, that have the black holes at their center.All, or most, galaxies have a giant black hole at their center.
Active Galaxies are thought to be powered by rotation
Earth is a planet. Center's of galaxies sometimes contain black holes. Planets can't be black holes.
Let's put it this way... All larger galaxies have huge black holes in their center. In addition to that, you can expect any galaxy to have a significant number of stellar black holes.
Most galaxies, including our own, have black holes in their centers.
Yes. Some galaxies, particularly irregular galaxies, appear to lack supermassive black holes.
Most galaxies - the larger ones at least - have a supermassive black holes in their center.
All galaxies have supermassive black holes in their centers.
Black holes emit so very little radiation they are hard to see. Many black holes lie at the center of galaxies and there they are hidden by stars and dust.
quasar
It is hypothesized that almost all galaxies have super massive black holes in their center.