G-type stars are a category of stars that have a surface temperature between 5,300 and 6,000 degrees Celsius. They are characterized by their yellowish color and are often referred to as "yellow dwarfs." The most well-known example of a G-type star is our own Sun, which provides the necessary light and heat for life on Earth. These stars typically have a lifespan of about 10 billion years and are in the middle of the stellar classification system. G-type stars fuse hydrogen into helium in their cores, a process that generates energy. This fusion process is crucial for maintaining their stability and brightness throughout their life cycle.