First off, someone needs to explain what we're looking at. I'd also like someone to tell me the origin/history of the H-R diagram. Next, I need people to add information that hasn't been included. You'll need a better look at the diagram, so feel free to download the picture file to view it's details.
This blog is for you...
Feel free to share some curious train of thought you have, as well as share your thoughts on others.