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Stars and the Interstellar Medium

Description
Stars and the Interstellar Medium
(c) Each dot plotted on this H-R diagram represents a star in the Pleiades whose luminosity and surface temperature have been
determined. Note that most of the cool, low-mass stars have arrived at the main sequence, indicating that hydrogen fusion has
begun in their core. The cluster has a diameter of about 5 ly, is about 100 million years old, and contains about 500 stars
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