Discover how galaxies are classified based on their shape, size, and appearance in this comprehensive guide. Explore the different types of galaxies and the criteria used to categorize them in the realm of astronomy.
In astronomy, galaxies are classified based on their shape, size, and appearance. The classification of galaxies helps astronomers better understand the vast diversity of celestial bodies in the universe. One of the most commonly used systems for galaxy classification is the Hubble sequence, named after the renowned astronomer Edwin Hubble.
There are three main types of galaxies: spiral galaxies, elliptical galaxies, and irregular galaxies. Each type has its own distinct characteristics that help astronomers classify them.
Spiral galaxies are characterized by their spiral arms that extend outwards from a central bulge. They are further classified based on the tightness of their spiral arms and the size of their bulge.
Elliptical galaxies are oval or round in shape and lack the distinct spiral arms seen in spiral galaxies. They are classified based on their elongation or flattening.
Irregular galaxies do not have a specific shape and do not fit into the categories of spiral or elliptical galaxies. They are typically small and chaotic in appearance.
Overall, astronomers use a combination of shape, size, and appearance to classify galaxies and study their properties in the vast universe.
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