Imagine that a large collection of stars with a wide
assortment of masses forms in a group. Draw sketches of the Hertzsprung-Russell
diagram at three times: (a) soon after they formed; (b) at the end of the
main-sequence life of a star similar in mass to the Sun; (c) at the end of the
mainsequence life of a star much less massive than the Sun. Describe in words
the differences between the three sketches.
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