Galaxies are categorized into three primary types based on their shapes and structures. Spiral galaxies, like the Milky Way, have a flat, rotating disk containing stars, gas, and dust, along with a central concentration of stars known as the bulge. Elliptical galaxies are more rounded and lack the distinct structure of spiral galaxies, often containing older stars and less interstellar matter. Irregular galaxies do not fit into the other categories and have an irregular shape, often resulting from gravitational interactions with other galaxies. The Milky Way, where Earth resides, is classified as a spiral galaxy due to its characteristic arms and central bulge.

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Answer 1

Galaxies are classified into three main types:

1. Spiral galaxies (e.g., the Milky Way) have a flat, rotating disk with stars, gas, and a central bulge.
2. Elliptical galaxies are rounded, contain older stars, and lack the structure of spirals.
3. Irregular galaxies have no distinct shape, often due to gravitational interactions with other galaxies.

The Milky Way is a spiral galaxy, noted for its arms and central bulge.