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Nebulae are vast clouds of dust and gas that can be found throughout the universe, often serving as stellar nurseries where new stars form. They are characterized by their brightness and variety of colors and shapes, which result from different chemical compositions and physical conditions within the cloud. Nebulae play a crucial role in understanding the life cycle of stars and the evolution of galaxies. They can be found in many places in the universe, including our own Milky Way galaxy. In the context of astrophysics, the study of nebulae involves understanding their physical properties, chemical composition, and the processes that give rise to their diverse appearances. This knowledge is used to explore the broader topics of star formation, interstellar medium, and galactic evolution, making nebulae an essential part of the hierarchy of science, astronomy, and astrophysics.