The Sun is 864,400 miles (1,391,000 kilometers) across. This is about109 times the diameter of Earth. The Sun weighs about 333,000 times as much as Earth. It is so large that about 1,300,000 planet Earths can fit inside of it.   The innermost layer of the sun is the core. With a temperature of 15 million kelvins (27 million degrees Fahrenheit) The outermost layer of the sun is the