An O-type main-sequence star is a massive and hot star that falls within the spectral classification of O. These stars are characterized by their high temperatures, typically exceeding 30,000 Kelvin, and they emit a blue or blue-white light. Due to their immense mass, often more than 16 times that of the Sun, O-type stars have short lifespans, usually lasting only a few million years before evolving into supernovae or other stellar remnants. O-type stars are significant in the study of stellar evolution and galaxy formation because they produce large amounts of ultraviolet radiation, influencing their surrounding environments. They are often found in star clusters and are key contributors to the chemical enrichment of the interstellar medium through their explosive deaths.