Airty Nothing , 2008 Sea Sky , 2008 . 4 . Discuss basic ideas of the main sequence chart (Hertzsprung-Russell (HR ) Diagram . The HR diagram is basically a graph in which the luminosity of the stars (absolute magnitude ) is charted against the surface temperature (color . This chart was discovered separately by Ejnar Hertzsprung and Henry Norris Russell in the 1910 's . This was following several scientists query whether the temperature of the object could be determined from the color of radiation it emitted . Courtesy...
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