https://github.com/davepinch/pinchy.cc/blob/master/content/topics/people/j/john-miur/when-one-tugs-at-a-single-thing-in-nature.md
Rigel (stars.astro.illinois.edu) RIGEL (Beta Orionis). Like its class M reddish rival in Orion, Betelgeuse, Rigel (Beta Orionis) is a supergiant, though a contrasting blue one (actually more blue-white) of class B (B8).
