>It is among the largest known stars, if not the largest, and one of the most luminous red supergiants, with an estimated radius around 2,150 times that of the Sun (R), which corresponds to a volume nearly 10 billion times bigger than the Sun.
>If placed at the center of the Solar System, its photosphere would engulf the orbit of Saturn.
>It is also one of the most luminous red supergiants known. With a surface temperature of 3,200 K, it shines with about 440,000 solar luminosities.
>https://en.wikipedia.org/wiki/Stephenson_2-18
>https://www.star-facts.com/stephenson-2-18/
How in the hell does a star get this big? It must be well past its main sequence.
>If placed at the center of the Solar System, its photosphere would engulf the orbit of Saturn.
>It is also one of the most luminous red supergiants known. With a surface temperature of 3,200 K, it shines with about 440,000 solar luminosities.
>https://en.wikipedia.org/wiki/Stephenson_2-18
>https://www.star-facts.com/stephenson-2-18/
How in the hell does a star get this big? It must be well past its main sequence.
