Stephenson 2-18, a red supergiant, has recently became the largest known star with an estimated radius around 2,150 times that of the Sun (R☉), which corresponds to a volume nearly 10 billion times that of the Sun.

Stephenson 2-18, a red supergiant, has recently became the largest known star with an estimated radius around 2,150 times that of the Sun (R☉), which corresponds to a volume nearly 10 billion times that of the Sun.