Who popularized the classification system that categorizes galaxies into spirals, ellipticals, and irregulars?
Answer
Edwin Hubble
Edwin Hubble is the astronomer responsible for the classification system that distinguishes galaxies based on their shape. This system remains a fundamental tool for astronomers to estimate the interstellar medium and star-forming potential within these galactic structures. By categorizing them, scientists can better understand the evolution of different galactic types and their associated gas content.

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