Which three main components make up a typical Spiral galaxy structure?
Answer
Central bulge, flat rotating disk, and surrounding halo
A standard spiral galaxy possesses a clear, layered structure reflecting different stellar populations and dynamics. At the very center lies the central bulge, which is a spheroidal concentration densely packed with older, yellower stars. Extending outward from this core is the flat rotating disk. This disk is where the spiral arms reside and it harbors the bulk of the interstellar medium—the gas and dust responsible for ongoing star formation—along with younger, hotter stars. Finally, surrounding both the bulge and disk is the halo, which constitutes the outermost, less structured, and generally older stellar component.
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