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Hubble's galaxy classification diagram, often referred to as the "tuning fork," categorizes galaxies into three main types: elliptical, spiral, and irregular. The diagram resembles a fork, with elliptical galaxies on the left, spirals on the right, and irregular galaxies branching off below. Spiral galaxies are further divided into subcategories based on their structure, with "normal" and "barred" spirals. This classification helps astronomers understand the characteristics and evolutionary pathways of different galaxy types.

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Does Hubble Tuning-Fork show an evolutionary sequence?

The Hubble Tuning Fork diagram illustrates the morphological classification of galaxies, categorizing them into ellipticals, spirals, and barred spirals. While it visually represents relationships among galaxy types, it does not definitively depict an evolutionary sequence. Instead, it reflects a snapshot of galaxy morphology and suggests possible evolutionary pathways without asserting a linear progression. Thus, while it offers insights into galaxy characteristics, evolutionary interpretation requires additional context and data.


What are the categories of galaxies?

There are three main types of galaxies: Elliptical, Spiral, and Irregular. Two of these three types are further divided and classified into a system that is now known the tuning fork diagram. When Hubble first created this diagram, he believed that this was an evolutionary sequence as well as a classification.


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