Hertzsprung-Russell Diagram

Created by Elnar Hertzsprung and Henry Russell

In the Hertzsprung-Russell Diagram (HR Diagram) each star is represented by a dot. The location of the dot on the diagram represents the star’s luminosity and temperature. The y-axis is luminosity in Lumes and the x-axis is surface temperature in Kelvin.

As you can see, all the stages of a stars life are represented on the HR Diagram. It shows all the stages luminosity and temperature in that stage.