Term | Definition |
---|---|
H-R Diagram | The Hertzsprung-Russell (HR) Color-Magnitude Diagram, is a graph upon which stars are plotted by spectral type and actual luminosity. It is named for the two scientists Russell and Hertzsprung who first used it in 1913. |
Highest Useful Magnification |
הגדלה מרבית אפקטיבית
|