<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> <P> The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively . All heavier elements, called metals in astronomy, account for less than 2% of the mass, with oxygen (roughly 1% of the Sun's mass), carbon (0.3%), neon (0.2%), and iron (0.2%) being the most abundant . </P>

What is the temperature of the suns photosphere
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