The sun is the largest and the most massive object in the solar system, but it is just a medium-sized star among the hundreds of billions of stars in the Milky Way galaxy.
The sun is nearly a perfect sphere. The diameter of the sun is about 864,938 miles (1.392 million km). This is about 109 times the diameter of Earth, which is about 12,742 km!
Sun is so large that about 1,300,000 planet Earths could fit inside of it!