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 ...

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 ...

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 ...

As stars age, a variety of observational characteristics naturally change. Some are dramatically obvious, while others are subtle. The calculated age’s accuracy depends on the star’s mass, its state ...