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[[Image:HRDiagram.png|thumb|270px|A Hertzsprung-Russell diagram plots the actual brightness (or [[absolute magnitude]]) of a star a ...ram]]s after their co-developers, [[Ejnar Hertzsprung]] and [[Henry Norris Russell]]. Stars on this band are known as '''main-sequence stars''' or "dwarf" sta ...

...erature of many stars against their luminosities, known as a [[Hertzsprung-Russell diagram]] (H–R diagram), allows the age and evolutionary state of a star to ...ing the first decades of the twentieth century. In 1913, the [[Hertzsprung-Russell diagram]] was developed, propelling the astrophysical study of stars. Succe ...