In the HR diagram, most stars are

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The majority of stars are located in the main sequence in the HR diagram. This is because the main sequence represents the stage where stars are fusing hydrogen into helium in their cores, which is the most common stage in a star's life cycle. Red giants and white dwarfs are much less common stages and thus represent a smaller portion of the stars in the HR diagram. Random scattering of stars is also unlikely, as there are patterns and trends observed in the HR diagram.

In the HR Diagram, Most Stars Are