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Hertzsprung-Russell diagrams - astronomy.swin.edu.aucosmoshhertzsprung-russelldiagram.pdf | ||
Spectra - courses.lumenlearning.comastronomychapterthe-spectra-of-stars-and-brown-dwarfs.pdf | ||
Spectra - www.britannica.comsciencestar-astronomyStellar-spectra.pdf |