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Updated: May 19, 2025
Johnstone Stoney advocated, in 1867, the comparative youth of red stars; A. Ritter, of Aix-la-Chapelle, divided them, in 1883, into two squadrons, posted, the one on the ascending, the other on the descending branch of the temperature-curve, and corresponding, presumably, with Secchi's third and fourth orders of stars with banded spectra.
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