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The 18 pages that link to Stellar radius, each with the reason it gives.

• Hertzsprung–Russell diagramRelated: At a given temperature, radius determines luminosity and separates giants from dwarfs.

• Red giantRelated: The defining expansion makes a red giant’s radius far larger than it was on the main sequence.

• Stellar luminosityRelated: A larger emitting surface raises luminosity at the same effective temperature.

• Stellar massCompared with: Radius measures size, while stellar mass measures the matter bound in the star.

• AsteroseismologyRelated: Oscillation amplitudes and frequency spacings help determine stellar radii.

• Red supergiantRelated: Red supergiants have exceptionally large radii compared with the Sun.

• Roche-lobe overflowRelated: Overflow starts when the donor’s radius grows to its Roche-lobe radius.

• Eclipsing binaryRelated: Eclipse duration and shape constrain the sizes of both stars.

• Angular diameterRelated: Combining a star's angular diameter with its distance yields its physical radius.

• Bolometric luminosityRelated: Radius can be inferred from luminosity and effective temperature using the Stefan–Boltzmann law.

• Blue supergiantRelated: A large radius helps produce high total luminosity despite the star’s compactness relative to red supergiants.

• Red-giant branchRelated: Large radii account for the high luminosities of cool branch stars.

• VY Canis MajorisRelated: Its unusually large estimated radius is central to VY Canis Majoris's reputation.

• AlgolRelated: Eclipse durations and depths constrain the sizes of Algol’s stars.

• Giant starRelated: A giant’s large radius explains its high luminosity at a given surface temperature.

• SupergiantRelated: Their large radii help distinguish supergiants from less luminous stars of similar temperature.

• HypergiantRelated: Large radii characterize many, but not all, hypergiants.

• UY ScutiRelated: Estimates of this quantity place UY Scuti among the largest known stars.