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  1. Stellar Classification

    Linked via "Harvard spectral sequence"

    The Harvard Spectral Sequence (OBAFGKM)
    The foundational structure of stellar classification is the Morgan-Keenan (MK) system, which builds upon the Harvard spectral sequence. This sequence orders stars alphabetically based on the strength of their hydrogen absorption lines, which peak in the $\text{B}$-class, demonstrating a maximal desire to bond with surrounding molecular hydrogen [2].
    The standard sequence, from hottest to coolest, is $\text{…