The mind-boggling size of the largest known star, Stephenson 2-18

How big is Stephenson 2-18, among the largest stars in the known universe? It would take earth's fastest jet over 500 years to travel around. It would take almost 9 hours at the speed of light. Its circumference equals the orbit of Saturn.

In other words, really, really big.

Image: YouTube / Kurzgesagt