If you want to help someone move on, you don’t label people as good, bad, worst or best. This categorizes people, rather than experiences with that person. People are not all evil or all good....
—Shannon L. Alder
In my opinion the separation of the c- and ac-stars is the most important advancement in stellar classification since the trials by Vogel and Secchi … To neglect the c-properties in classifying stellar spectra, I...
—Vogel
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