GalaxyA galaxy is a huge group of stars, gas and dust bound together by gravity. They are the building blocks of universe. There are about galaxies in this universe. Some examples of galaxies are Milky Way and Starburst Galaxy.
Types of galaxiesElliptical galaxies:
Elliptical galaxies are most common galaxies in the universe. Most of the stars in them are relatively dim and they are more difficult to see than other types of galaxies. They contain trillions of stars or even more. The width of the elliptical galaxies is as much as 2 million light years.
Spiral galaxies are the most beautiful arrangement of stars in the universe. They are bright and have newly formed stars. These galaxies when viewed from one direction, they look like a flat disc with a central bulge and the thickness tapers off towards the edge.When viewed from a perpendicular direction they look like a spiral.Our own Galaxy, Milky Way is a typical example of a spiral galaxy.
Irregular galaxies as the name itself suggests having no spiral arms or dense centers. They are normally small and faint and are difficult to detect
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