K-Numbered Stars are a classification of stars based on their brightness and temperature. The "K" refers to a specific spectral type in the Harvard classification system, which categorizes stars into different classes. K-type stars are typically orange in color and have surface temperatures ranging from about 3,900 to 5,200 Kelvin. They are cooler than G-type stars, like our Sun, and are known for their longevity. These stars are often found in the main sequence phase of their life cycle, where they fuse hydrogen into helium in their cores. K-Numbered Stars can vary in size and mass, but they generally have a lower luminosity compared to hotter stars. Their stable nature makes them interesting for studying planetary systems, as they provide a more stable environment for potential exoplanets.