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Across 2. The radiation zone or radiative zone is a layer of a star's interior where energy is primarily transported toward the exterior by means of radiative diffusion, rather than by convection. 3. a reddish gaseous layer immediately above the photosphere of the sun or another star. Together with the corona, it constitutes the star's outer atmosphere. 4. a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy 5. the luminous envelope of a star from which its light and heat radiate. 6. the rarefied gaseous envelope of the sun and other stars.

Down 1. A region of turbulent plasma between a star's core and its visible photosphere at the surface, through which energy is transferred by convection.