Photosphere but more tenuous corona. Other "surface features" on the photosphere are solar flares and sunspots. Photosphere 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, or equivalently, a depth from which 50% of light will escape without being scattered. In other words, a photosphere is the
A Star Is Born (Jay-Z song) were ultimately used in the final mix. Williams himself was not aware of the prominence of his vocals on "A Star Is Born" until his friend Omar Edwards approached him and complimented his performance on the song. "A Star Is Born" received mixed reviews from music critics. Charles Aaron of "Spin" praised its "anthemic, edgy soul-clap" beat and the two rappers' individual performances, lauding Jay-Z in particular as "effortlessly dazzling". "Pitchfork"s Ian Cohen, however, dismissed the song as a "numbingly non-committal salutation" Alexis Petridis, writing for "The Guardian", negatively described "A Star Is Born" as a "mass of indistinct tracks".