A massive star can shed mass and shrink into a hotter hypergiant phase as it evolves.

Light takes 8.7 hours to circle Stephenson 2-18 once. An Earth aircraft would need roughly 500…

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Rho Cassiopeiae packs 40 Suns of mass into a star 500 Suns wide.

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Pistol Star contains 25 times the Sun’s mass but spans 300 times its radius.

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Gacrux is only 30% more massive than the Sun, yet has swollen to about 84 solar radii.

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Supermassive stars usually stop growing around 150 solar masses when intense radiation blows away…

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Hypergiants are expanded massive stars whose weak surface gravity lets powerful winds strip them…

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After core hydrogen runs out, a star can expand hundreds of thousands of times larger during a…

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Red dwarfs barely fuse hydrogen, so they stay small, cool, and dim instead of swelling after death.

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