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Betelgeuse, or Alpha Orionis, second brightest star in the constellation Orion. The name was given to it by Arab astronomers (bayt al-jawzaa, “house of twins” in Arabic). Betelgeuse is a regular variable first magnitude red giant with a diameter up to 420 times that of the sun. It is about 500 light-years from Earth.

See also: Orion.

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