Stephenson 2-18 is among the largest known stars. It has an estimated radius of around 2,150 solar radii (1.5×10⁹ kilometres; 10 AU), which would correspond to a volume nearly 10 billion times that of the Sun [source: buff.ly/3nYCNjj]
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The largest possible star is probably around 2,500 solar radii, so something even bigger is out there, waiting to be discovered.
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Missed opportunity to brand it something memorable… like “Stephenson Incinerator™️”.
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The error bars are pretty huge regarding the sizes of these gigantic stars, aren't they?
Still, very impressive to contemplate.
