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Hertzsprung-Russell Diagram

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Also Know

O, B, A, F, G, K, and M
Hertzsprung-Russell ordered their chart by assigning a letter representing a star's spectral class. To find out more just click the above link.

W, O, B, A, F, G, K, M, R, N, S
Wow! Oh, Be A Fine Girl/Guy, Kiss Me Right Now Sweetie! A new mnemonic. Wikipedia page explaining this Main sequence mnemonic.