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Examples
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[8] refined the classification from the original A-Q gamut to the familiar "OBAFGKM" gamut.
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OBAFGKM (LT), though invented by one of the most admirable and brilliant women of the 20th century, is universally remembered by scientists, graduate students, and backyard astronomers as "Oh, Be a
Logophile77 commented on the word OBAFGKM
The spectral types of stars, O being the hottest and M being the 'coldest'. If it be of interest, Sol is a G2V star. See also Hertzsprung-Russell diagram.
https://en.wikipedia.org/wiki/Stellar_classification
https://en.wikipedia.org/wiki/Hertzsprung–Russell_diagram
March 5, 2018