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The hypergiant star could hold nearly ten billion Suns inside its volume. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Stephenson 2-18 is one of the largest known stars in the universe

The hypergiant star could hold nearly ten billion Suns inside its volume

Stephenson 2-18 is a red hypergiant star located roughly 20,000 light-years from Earth. With an estimated radius nearly 2,150 times that of our Sun, if placed at the centre of our solar system, its outer surface would extend beyond the orbit of Saturn.

Stephenson 2-18 (labelled) — NASA/IPAC Infrared Science Archive (IRSA) · CC BY 4.0 · licence · source

Where this comes from

Encyclopaedia Britannica

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Tags: hypergiant, star, radius

Stephenson 2-18 is one of the largest known stars in the universe: the short answers

Where does this come from, and can I check it?: The hypergiant star could hold nearly ten billion Suns inside its volume. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a space fact?: Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.