Discover the Hertzsprung-Russell diagram, a key tool graphing the brightness of stars against color in astronomy. That's really funny, and I wish I had thought of it. The vertical axis is fame, as ...

A simple diagram, which celebrates its centennial this year, continues to serve as the most essential conceptual tool in stellar astrophysics Modern astronomy paints a vivid picture of the universe ...

Imagine you are being given an important assignment by a taskmaster with a strange sense of humor. Your job is to study a forest, but you can only work according to a rather bizarre set of rules. For ...

HR Diagram by GeneSmith http://casswww.ucsd.edu/public/tutorial/HR.html A good, short summary of the HR diagram HR Diagram and Stellar Ages http://www.britannica.com ...