How do the typical diameters of K-type stars compare to the Sun's diameter ($1.39$ million kilometers)?
Answer
They are generally smaller, potentially exhibiting a radius 60 to 85 percent of the solar radius.
The physical dimensions of a star are fundamentally linked to its mass and evolutionary stage. Since K-type stars are less massive than G-type stars like the Sun ($1.0 M_ ext{sun}$), their physical size is consequently smaller. While the exact diameter varies depending on the precise spectral subtype (e.g., K0 versus K7), the general range cited indicates that their radius falls between 60 percent and 85 percent of the Sun's radius. This reduction in physical scale is a direct consequence of having less material undergoing fusion pressure.
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