spiral galaxies

Spiral galaxies are a type of galaxy characterized by their distinct, swirling arms that extend outward from a central bulge. They consist mainly of stars, gas, and dust, with the arms containing younger, hotter stars, while older stars reside in the central bulge. The Galaxy’s rotation causes this spiral shape, and they can vary in size and brightness. Our Milky Way is a well-known example of a spiral galaxy. Spiral galaxies are essential for studying the universe's structure, formation, and the life cycle of stars.