Recently, a scientific research team led by Shanghai Observatory of Chinese Academy of Sciences proposed a new and quantitative galaxy structural model, depicting the geometric structure of a general disc galaxy similar to Milky Way as a "chocolate crushed biscuit" - the elderly stars in the galaxy and the diffuse galaxy medium between them constitute the main components of the "biscuit", and the star formation area distributed in clumps forms the darker "chocolate crushed biscuit".
It is reported that most galaxies in the universe have experienced tens of billions of years of star formation and evolution. For most galaxies, although they have passed the most intense "main life" of their star formation, they are still forming new stars to this day. In the evolution of galaxies, generations of stars have produced various heavy elements in nuclear fusion . These heavy elements gradually form small solid particles through complex physical and chemical reactions in cold gas clouds - what astronomers call "dust".
Astronomers found through a large-scale "census" that there are a large number of disc-shaped galaxies similar to the Milky Way in the neighboring universe. In these disc-shaped galaxies, the interstellar dust dispersed between the elderly and stars presents a continuous flat structure distribution, while the dust claddings around the new star-forming region and its surrounding dust are clumped and distributed in a flatter disk structure. Through the analysis of the "chocolate crushed cookies" model, the researchers found that the elderly stars and the interstellar medium , which are diffusely , form the main body of the cookie, and the embedded chocolate fragments vividly depict the birth area of the new star.
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