A spectral class of stars whose surface temperatures lie in the range 11,000 to 25,000 Kelvin, typified as having a bluish colouration.
The supergiant Rigel or Beta Orionis is the brightest B-type blue star in the skies of Earth. The star shown to the north and slightly to the east of Rigel here is Tau Orionis, also a blue star, which is actually considerably closer to the Sun than Rigel, but (despite being a giant star itself) is comparatively much less luminous. Imagery provided by Aladin sky atlas
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