Transcript for scene 34 of the video " The Incredible Experience vs Ice Age - part 2" by Rolf Witzsche  

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The giant active star, Rigel, is of the B class

In the classification by surface temperature, the giant active star, Rigel, is of the B class of roughly half a billion stars. The O class of stars with surface temperature exceeding 30,000 degrees, typically into the range of 65,000 degrees, is extremely small. Only 20,000 stars of this group are believed to exist in our galaxy. They are typically found at the center of a nebula. Their luminosity is several million times that of the Sun.

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche