K stars, also known as K-type stars, are a class of stars that are slightly cooler than the Sun and have spectral type K on the stellar classification system. These stars have temperatures ranging from about 3,500 to 5,000 Kelvin and are characterized by their orange hue. K stars are common in the Milky Way galaxy and are often found as part of binary star systems. Research on K stars includes studying their physical properties, such as their mass, radius, and luminosity, as well as their variability and magnetic activity. Scientists also investigate the potential habitability of planets orbiting K stars, as these stars are considered to be promising candidates for hosting Earth-like exoplanets. Additionally, research on K stars can provide insights into the evolution and formation of stars in the universe.