Quote:
Originally Posted by JohnF
In ancient times Betelgeuse was yellow, not Red. Quoting Wikipedia:--
"By contrast, three centuries before Ptolemy, Chinese astronomers observed Betelgeuse as having a yellow coloration."
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I suspect the idea of what is a "red" star has shifted more since these observations than B's actual spectrum. I too would not consider B's colour red if I saw it anywhere else. If I ordered tomato soup and it came in that colour, I'd return it. The carbon star in Crux, now
that's red.