Figure 1
Illustration: Robert Hollow, Commonwealth Science and Industrial Research Organisation (CSIRO), Australia, adapted by Carin Cain

Figure 1: Astrophysicists categorize star types and stellar evolution scenarios using the Hertzsprung-Russell diagram, which organizes stars in terms of their luminosity (which is related to their mass and size) and color (surface temperature). The blue lines show three different evolutionary scenarios for stars of 1 solar mass, 5 solar masses, and 10 solar masses as they move from hydrogen burning, to helium burning, and beyond.