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Start with the full category, then apply the exact boundary: The interior below the photosphere. Atmospheric layers such as the corona are excluded. You only need one qualifying answer. A longer name is not automatically rarer.
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Radiation zoneRadiative zone · 75 points · 14 characters
The radiative zone lies outside the core and transfers energy mainly by radiation.
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Radiative zone75 points · Shortest accepted spelling: Radiation zone
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- Apply the complete question boundary: The interior below the photosphere. Atmospheric layers such as the corona are excluded.
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Source: NASA · Layers of the Sun ↗
Reference version: 2026-10-21. See our answer policy for how we handle aliases and omissions.