Class G refers to a classification of stars that are similar to our Sun, categorized by their temperature and brightness. These stars typically have surface temperatures ranging from about 5,300 to 6,000 degrees Celsius. They are known for their yellowish color and are part of the Hertzsprung-Russell diagram, which is a tool used by astronomers to classify stars based on their luminosity and temperature. In the stellar classification system, Class G stars are often considered stable and can have planets orbiting them, making them potential candidates for hosting life. The most well-known example of a Class G star is Sol, or the Sun, which provides the necessary heat and light for life on Earth.