Triple stars are systems that consist of three stars bound together by gravity. These stars can interact in complex ways, often influencing each other's orbits and brightness. Triple star systems can be classified into different types, such as hierarchical systems, where two stars orbit closely while the third orbits farther away. Astronomers study triple stars to learn more about stellar formation and evolution. By observing the gravitational interactions and movements of the stars, researchers can gather valuable data about their masses and distances. Notable examples of triple star systems include Alpha Centauri and Sirius.