Ace the PSIA Science Quiz 2026 – Ignite Your Knowledge and Score Big!

A binary star, which consists of two stars that are gravitationally bound to each other and orbit a common center of mass, is commonly referred to as a double star. This term emphasizes the dual nature of these systems, distinguishing them from single stars, which exist independently, and from triple or higher-order star systems, which contain three or more stars. While "binary system" is also a term used to describe these pairs, "double star" is the more precise name that conveys the specific relationship between the two stars involved. This nomenclature is widely used in astronomy to classify and identify these types of stellar systems.