Astronomy - Ch. 17: The Nature of Stars (31 of 37) Determining Stellar Radii

[@LearnMechanicalinதமிழ்]

Sir but velocity of small and big star are different and how can we measure by this sir??

[@MichelvanBiezen]

We can use the doppler shift to measure the speed of the stars

[@papaukke]

luminosity diagram has an error.