In most of the galaxies, the stars are not uniformly distributed, but instead are arranged in certain patterns. The most frequent ones are spiral galaxies. The center of such galaxies is thick with several old, red shining stars. A flat disc stretches all around this center in which the individual arms of the spiral are present. It has a thickness of just about 100 light years, which is very thin as compared to the size of a galaxy. The spiral arms contain a lot of young bright blue stars. If a spiral galaxy has only two arms, it is called barred spiral galaxy. Other types of galaxies are the egg-shaped 'elliptical galaxies' and the 'irregular' galaxies, which are completely disordered.
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