Galaxy .....

A galaxy is a vast system composed of stars, stellar remnants, interstellar gas, dust, dark matter, and other celestial objects bound together by gravity. Galaxies come in various shapes and sizes, including spiral, elliptical, and irregular forms. Our solar system resides in the Milky Way, a spiral galaxy containing billions of stars. Galaxies are fundamental units of the universe, playing a crucial role in its structure and evolution.