HR Diagram - a tool that plots the luminosity and temperature of stars, O-type star - hottest, M-type star - Coolest, The Sun - G2 (medium heat), luminosiry - a measure of a star's energy output, Max Plancke - linked star emission to its temperature, Meghnad Saha - studied atomic emissions at high temps, Cecelia Payne-Gaposchkin - found stars are mainly Hydrogen (and then Helium),

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