Spiral galaxies are a type of galaxy characterized by their flat, disk-like shape with spiral arms winding outward from the center. They contain a mix of young and old stars, gas, and dust, making them sites of active star formation.
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Spiral galaxies are categorized into three main types: Sa, Sb, and Sc based on the tightness of their spiral arms and the size of their central bulge.
The Milky Way is an example of a barred spiral galaxy, classified as SBbc.
Spiral arms are regions with higher concentrations of gas and young stars due to ongoing star formation.
These galaxies often have supermassive black holes at their centers.
They make up about 60-70% of all observed galaxies in the universe.