spiral galaxy
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A spiral galaxy is a type of galaxy with a bright central core of older stars surrounded by curved arms of younger stars that spiral outward like a pinwheel. These galaxies are important because they represent one of the most common structures in the universe and help astronomers understand how galaxies form and evolve over time.
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An example of a spiral galaxy, Messier 77 (also known as NGC 1068)
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part of the Hubble sequence. Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge. These are often surrounded by a much fainter halo of stars, many of which reside in globular clusters.