Star Features is a term used to describe the unique characteristics of a star. It includes physical properties such as size, temperature, luminosity, and composition, as well as other features such as age, distance, and motion. The term can also refer to the features of a star system, such as the number of planets or moons in orbit around it. EGOS is an acronym for Extra-Galactic Objects Survey, which is a survey of galaxies and other objects outside of our own Milky Way galaxy.