Betelgeuse
It is also one of the largest and most luminous observable stars. It has a radius between 500 to 800 times wider than the Sun. This means it is 696 million to 1.113 billion kilometers in diameter. Betelgeuse was the first star other than the Sun whose size was known. The star's distance from Earth is about 410 light-years. Its average absolute magnitude is about −6.02.