what was one fact that you learned about Spiral Galaxies that you thought was interesting?(nothing is not an answer) square

One interesting fact about spiral galaxies is that they are believed to be the most common type of galaxy in the universe. This is based on observations of galaxies in various regions of the universe, including the Milky Way, which is a spiral galaxy. Spiral galaxies are characterized by their spiral arms, which are regions of higher density of stars and gas. These arms are thought to be the result of the galaxy's rotation, with the spiral arms forming as a result of the gravitational attraction of the galaxy's central bulge. This structure is believed to be the result of the galaxy's rotation, with the spiral arms forming as a result of the gravitational attraction of the galaxy's central bulge.