Thespectral sequenceof stars is not alphabetical because it is based on the temperature and spectral characteristics of stars, rather than being organized in alphabetical order.The spectral sequence, also known as thestellar classification system, categorizes stars based on their spectral lines and the characteristics of their spectra. The classification system was developed by astronomers Annie Jump Cannon and Edward C. Pickering in the late 19th and early 20th centuries.In the spectral sequence, stars are classified into different spectral types, denoted by letters such as O, B, A, F, G, K, and M. These letters are assigned based on the presence and strength of certain spectral lines in the star's spectrum, which correlate with thestar's temperature. For example, stars of type O have the hottest temperatures, while stars of type M have the coolest temperatures.The order of the spectral types in the sequence reflects the changing characteristics of the stars as their temperatures decrease. The sequence was originally organized in a rough alphabetical order based on the order in which the spectral lines were discovered and identified. However,subsequent refinementsto the classification system have led to changes and reordering of the sequence based on more precise temperature measurements and spectral analysis.Therefore, the spectral sequence of stars is not alphabetical because it is based on the temperature and spectral characteristics of stars rather than following a strict alphabetical order.To know more about thespectral sequencerefer here,brainly.com/question/32255780##SPJ11...

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