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
Esther (given name) Esther (given name) Esther () is a feminine given name known from the Jewish queen Esther, eponymous heroine of the "Book of Esther". According to the Hebrew Bible, queen Esther was born with the name Hadassah ("Myrtle"). Her name was changed to Esther to hide her identity upon becoming queen of Persia. The root of Esther in Hebrew is "hester" () "Hidden". The name can be derived from the Old Persian "stāra" (NPer. ستاره "setāra", meaning "star") although some scholars identify Esther with the name of the Babylonian goddess of love "Ishtar". Esther first occurs as a given name in