Halo Stars are a type of star found in the outer regions of a galaxy, specifically in the galactic halo. They are typically older and less luminous than stars found in the main disk of the galaxy. These stars are often metal-poor, meaning they contain fewer heavy elements, which indicates they formed early in the universe's history. The study of Halo Stars helps astronomers understand the formation and evolution of galaxies. By analyzing their properties, scientists can gain insights into the conditions of the early universe and the processes that led to the creation of stars and galaxies over billions of years.