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an extremely bright star of very large diameter and low density

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See how Betelgeuse (top left) in Orion is orange-red in colour with an average magnitude of 0.6 while the brighter, blue-white supergiant star, Rigel (bottom right) hasamagnitude of 0.14.
This hot, blue-white supergiant is believed to be part of the Scorpius-Centaurus OB Association ("Sco-Cen"), a large region of recent and ongoing star formation that counts among its members many of the brighter stars in tonight's sky.
|Chi.sup.2~ is a blue-white supergiant about 3,500 light-years distant and some 30,000 times brighter!