History of the Universe Project
Stars
Hertzsprung-Russell Diagram
Magnitude (Brightness) v. Spectral Type (Temperature)
Magnitude (Brightness) v. Spectral Type (Temperature)
The HR diagram is a plot of brightness and color. The gray areas on the HR diagram reveal different categories of star (0 thru VII). Stars usually begin their lives hot (to the left on the diagram) and cool down as they age (to the right on the diagram).
For more information, visit this site by astronomer Jim Kaler:
THE NATURES OF THE STARS
For more information, visit this site by astronomer Jim Kaler:
THE NATURES OF THE STARS