Which stellar classification letter represents the coolest stars, often appearing red, in the sequence O, B, A, F, G, K, M?
Answer
M
The standard spectral classification sequence used to organize stars based primarily on temperature runs from the hottest to the coolest: O, B, A, F, G, K, and M. Type O stars are the hottest, exhibiting intense blue coloration, while Type M stars occupy the opposite end of this sequence. These M-type stars are the coolest stars in the sequence, often characterized by low surface temperatures that cause them to peak in the redder wavelengths, leading to a reddish visual appearance.
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