![The Scientific Odyssey show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/078/825/small/the-scientific-odyssey.jpg)
Summary: In the years between 1905 and 1911, the astronomer Ejnar Hertzsprung and Henry Russell Norris developed a way of representing the accumulating astronomical and astrophysical data on stars that revealed the presence of a relationship between a stars brightness and its temperature. This Hertzsprung-Russell or H-R Diagram would come to revolutionize our understanding of stellar evolution.