First of all a galaxy is a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
Spiral galaxies are the most intriguing visually but there are many different types of galaxies such as
Elliptical they are basically all bulge with no disk. They can range from spherical to football-like shapes
Irregulars - catchall type for galaxies without symmetric shapes, and no clear bulge or disk this is the most common type of galaxy
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