A K-type Main-Sequence Star is a type of star that falls within the spectral class K. These stars are cooler than the more common G-type stars like our Sun, with surface temperatures ranging from about 3,900 to 5,200 Kelvin. K-type stars are often orange in color and are known for their long lifespans, lasting several billion years. These stars generate energy through nuclear fusion, primarily converting hydrogen into helium in their cores. K-type Main-Sequence Stars are typically less luminous than F-type and G-type stars, making them less visible to the naked eye. They can host planetary systems, potentially allowing for the existence of habitable zones.