Our sun is classified as a G-type main-sequence star (G dwarf star). This classification is based on its temperature, luminosity, and size. The surface temperature of the sun is about 5,500 degrees Celsius (around 9,932 degrees Fahrenheit), which gives it a yellowish color. G-type stars are characterized by their stable nuclear fusion of hydrogen into helium in their cores, which leads to a balanced output of energy. The sun's categorization as a G dwarf star places it in a broader context of stellar evolution and helps scientists understand its lifecycle, including its eventual transformation into a red giant and, later, a white dwarf.