Universe
Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 18, Problem 33Q
To determine

Whether the most luminous stars in the Pleiades cluster that are present away from the main sequence, as shown in the figure below, are the protostars that are going to arrive at the main sequence or have already left it.

Universe, Chapter 18, Problem 33Q

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