When the universe was still young, different galaxies collided and interacted with each other frequently, so the spiral shapes of these ancient spiral galaxies would be disrupted quickly. Briefly elaborating, S0 galaxies are like a combination between a spiral galaxy and elliptical galaxy because of the bulge and disk that they do have, like spiral galaxies, but they do not have a spiral-like structure. Barred spirals, are when the spiral arms come out from a bar passing through the galactic center of the galaxy. Spiral galaxies are divided into two classes, normal spirals and barred spirals. The largest spiral galaxy is 5 times the size of the Milky Way and is 522,000 light years across. The disk in the galaxy can vary from 10 to 300 thousand light years across. These galaxies range from a billion to a trillion times the mass of the sun. Fact 2- Irregular galaxies are thought to have once been elliptical or spiral. About 60% of spiral galaxies have multiple arms, about 10% have two, and about 30% of spiral galaxies do not have well defined arms, their features have faded over time. Fact 1- Irregular galaxies are mostly made of hydrogen gas, and this is important for the formation of new stars. About 77% of all galaxies are spiral galaxies, including the one we live in, the Milky Way. Scientists think they could be a result of density waves traveling through the outer disk. If the arms were permanent features of the galaxy then the arms would disappear and wind up tightly in a billion years. Hypergalaxy is a system that consists of a dominant spiral galaxy that is surrounded by a cloud of smaller satellite galaxies which are often elliptical. The exact formation and mechanics of the spiral arms puzzle scientists. These arms are made up of an ongoing star formation that is brighter than the surrounding disc. These galaxies have arms that stretch out from the center and revolve around it. The central point in the galaxy, known as the bulge, is a large cluster of stars and is also thought to contain a supermassive black hole. A spiral galaxy is a pinwheel shape and mostly consists of a flat, rotating disk containing stars, gas, and dust.
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