Photosphere 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 deepest region of a luminous object, usually a star, that is transparent to photons of
A Star Is Born (2018 soundtrack) A Star Is Born (2018 soundtrack) A Star Is Born is the soundtrack album to the 2018 musical film of the same name, performed by its stars Lady Gaga and Bradley Cooper. It was released on October 5, 2018, by Interscope Records. Gaga and Cooper collaborated on the soundtrack album with an assortment of country musicians, including Lukas Nelson, who also stars in the film as a member of Cooper's band. For the more pop-oriented songs on the soundtrack, Gaga teamed up with recurring collaborator DJ White Shadow. The soundtrack also includes contributions from Jason Isbell, Mark Ronson, Diane Warren,