The Sun is nearly a perfect sphere. Its equatorial diameter and its polar diameter differ by only 6.2 miles (10 km). The mean radius of the sun is 432,450 miles (696,000 kilometers), which makes its diameter about 864,938 miles (1.392 million km). You could line up 109 Earths across the face of the sun. The sun's circumference is about 2,713,406 miles (4,366,813 km).

The total volume of the sun is 1.4 x 10^{27} cubic meters. About 1.3 million Earths could fit inside the sun. The mass of the sun is 1.989 x 10^{30}kilograms, about 333,000 times the mass of the Earth. The sun contains 99.8 percent of the mass of the entire solar system