An astronomical red giant is a type of STAR that is much larger and brighter than the sun. ANTARES, also known as Alpha Scorpii, is a red supergiant STAR located in the constellation Scorpius. STAR is a term used to describe a celestial body that is composed of gas and dust and emits light. Mira, also known as Omicron Ceti, is a red giant STAR located in the constellation Cetus. Cstar is a term used to describe a type of STAR that is cooler than a red giant. Sstar is a term used to describe a type of STAR that is hotter than a red giant.