What is the size and temperature of the sun?

The Sun has a diameter of about 1.4 million kilometers (approximately 864,000 miles), making it roughly 109 times wider than Earth. Its core temperature reaches around 15 million degrees Celsius (27 million degrees Fahrenheit), while the surface temperature is about 5,500 degrees Celsius (9,932 degrees Fahrenheit). This immense heat is generated through nuclear fusion processes occurring in the Sun's core.