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Zeta Ophiuchi (ζ Oph / ζ Ophiuchi) is a star located in the constellation of Ophiuchus. Unlike most of the brighter stars in the sky, ζ Ophiuchi does not have a proper name, although it may have been referred to as Hán (韓) by the Chinesemarker. Although ζ Ophiuchi is a hot blue giant star it appears reddish due to interstellar dust that absorbs much of blue light. In fact, were it not for this dust, ζ Ophiuchi would shine several times brighter and be among the very brightest visible. ζ Ophiuchi is roughly half way through the initial phase of its stellar evolution and will within the next few million years expand into a supergiant star before ending its life in a spectacular supernova.


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