The Morgan-Keenan (MK) system is a widely used stellar classification method that categorizes stars based on their spectral type and luminosity. Developed by William Wilson Morgan and Philip C. Keenan, it assigns stars a spectral class (O, B, A, F, G, K, M) based on temperature, with O-type stars being the hottest and M-type the coolest. It also includes a luminosity class (I-V) to distinguish between supergiants, giants, and main-sequence stars. This classification helps astronomers understand stellar properties, evolution, and their role in the universe.

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Morgan Keenan System

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