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Is a giant star that's formed when a star at least 10 times more massive than the Sun has burned all of the hydrogen in its core. The resulting supergiant is extremely large, massive and luminous.

Betelgeuse in Orion and Antares in Scorpius are both red supergiants.

Betelgeuse, α Ori, is a red supergiant star (credit:- Fred Espenak)

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