a) Describe Hubble’s Classification scheme for galaxies. 

Hubble's classification scheme for galaxies, devised by the renowned astronomer Edwin Hubble in the 1920s, revolutionized our understanding of galaxy morphology and structure. This scheme, commonly known as the Hubble Tuning Fork diagram, categorizes galaxies based on their visual appearance into three main classes: elliptical galaxies, spiral galaxies, and irregular galaxies.

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