Star classification

Numéro d’image : 11885388
Star classification
Stellar classification using a Hertzsprung-Russell diagram,a graph that plots the absolute magnitude (luminosity relative to the Sun) of a star against its surface temperature. This shows most stars on the main sequence curve (from lower right to upper left). A new star's position on the sequence depends upon its mass. Low-mass stars are cool and red. Medium-mass stars (like the Sun,circled) are yellow. High-mass stars are hot & blue. A medium- mass star leaves this curve at the end of its life as it expands and cools,moving right and above the curve as a red giant (like Betelguese,upper right). It then contracts to a white dwarf (like Sirius B,lower centre),ending below the curve
Licence : Droits gérés
Crédit: Science Photo Library / Lomberg, Jon
Taille de l’image : 4724 px × 3735 px
Model Release : Non requis
Property Release : Non requis
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