How big are Stars?

Our sun is quite a small star, even though is measures 1392530 km across, which is 109 more than the earth's diameter. If the sun were the size of a football, The earth would only be 2mm across. Some stars are known as Superiants. The star Antares, for example, is 700 times bigger than the sun. There is a star in the constellation of Auriga that may be 3000 million km in diameter, which is also known as 4000 times bigger than our sun. The neutron star that remains after the eplosion of a supernova may only be 20 km in diameter, but of enormous mass. If it weighs more than 2 or 3 times that of our sun, it begins to collapse into a black hole.