Ejnar Hertzsprung

While the Hertzsprung-Russel diagram was created over 100 years ago, in 1911 by Ejnar Hertzsprung to be exact, it is still a valid tool for studying stars. Although scientists have more advanced technology, which allows them to see further into the universe and provides the ability to research celestial objects in-depth, the H-R diagram is a basic measurement that is still helpful. The H-R diagram gives astronomers a way to classify stars. These classifications have been used for some time and will most likely continue to be because they are well-known and understood. Using the H-R diagram is something that middle-schoolers learn to do in their science classes. It is as if the H-R diagram set the standard for classifying stars. This instrument