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Question

What are the three main types of galaxies and how do their shapes differ from each other?

Answer

The three main types of galaxies are spiral galaxies, elliptical galaxies, and irregular galaxies. The shape of a spiral galaxy is a disk-shaped structure with spiral arms extending from its central bulge. Elliptical galaxies have a more rounded, elliptical shape which could range from nearly spherical to highly elongated. Irregular galaxies have no well-defined shape and could have a variety of shapes, like irregular blobs or distorted shapes caused by the gravitational interactions with other galaxies.

Galaxies can be classified as spiral galaxies, elliptical galaxies, or irregular galaxies. Spiral galaxies’ shape are disk-shaped with spiral arms extending from its central bulge. The shape of an elliptical galaxy varies from spherical to elongated. It can also be round, like the circle, or elongated like rugby ball. Irregular galaxies have no definite shape and may have different shapes like blobs, or they may have shapes caused by the gravitational influences of other galaxies. The shapes of galaxies are influenced by factors like the age and distribution of its stars, the amount of gas and dust present, and the influence of neighboring galaxies.