Exploring the H-R Diagram
Early this century, two researchers, Enjar Hertzsprung and Henry Norris Russell independently developed what has come to be known as the Hertzsprung-Russell (HR) diagram. The HR diagram is a plot of absolute magnitude/luminosity on the vertical axis versus spectral class/temperature/color on the horizontal axis. In this activity, you will create your own H-R diagram as well as explore its properties.

Read this activity in Acrobat!