Up to what approximate solar radius does the radiative zone extend outward from the center?

Answer

Approximately $0.75 R_{\odot}$

The radiative zone is a vast shell extending outward from approximately $0.25$ solar radii up to about $0.75$ solar radii.

Up to what approximate solar radius does the radiative zone extend outward from the center?

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How Do Convection And Radiation Zones Work In Stars? - YouTube

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