Green stars are a rare type of star that emit a greenish light due to their surface temperatures and chemical compositions. They are typically hotter than our Sun but cooler than the hottest stars, with temperatures ranging from about 10,000 to 30,000 degrees Celsius. Their unique color is a result of the specific wavelengths of light they produce. These stars are often found in the Milky Way galaxy and are usually massive, burning through their fuel quickly. Because of their short lifespans, they are not commonly observed, making them an interesting subject for astronomers studying stellar evolution and the life cycles of stars.