Star systems are groups of stars that are gravitationally bound together and orbit around a common center of mass. They can vary in size and complexity, with some containing only two stars (binary systems) while others may have multiple stars. The study of star systems involves understanding the formation, structure, dynamics, and evolution of these systems, as well as the interactions between the stars within them. Research in this area can help scientists better understand the processes that govern the birth and life cycles of stars, as well as the larger-scale structure and dynamics of galaxies.