<Ol> <Li> Core </Li> <Li> Radiation zone </Li> <Li> Convection zone </Li> <Li> Photosphere </Li> <Li> Chromosphere </Li> <Li> Corona </Li> <Li> Sunspot </Li> <Li> Granules </Li> <Li> Prominence </Li> </Ol> <P> The photosphere is a star's outer shell from which light is radiated . The term itself is derived from Ancient Greek roots, φῶς, φωτός / phos, photos meaning "light" and σφαῖρα / sphaira meaning "sphere", in reference to it being a spherical surface that is perceived to emit light . It extends into a star's surface until the plasma becomes opaque, equivalent to an optical depth of approximately 2 / 3 . In other words, a photosphere is the deepest region of a luminous object, usually a star, that is transparent to photons of certain wavelengths . </P> <P> The surface of a star is defined to have a temperature given by the effective temperature in the Stefan--Boltzmann law . Stars, except neutron stars, have no solid surface . Therefore, the photosphere is typically used to describe the Sun's or another star's visual surface . </P>

Where is the photosphere located what color is it