Why do star clusters provide excellent tests for theories of stellar evolution?

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    They always contain the same numbers of stars, so they can be compared to other clusters.
     The stars in any particular cluster are all approximately the same masses as each other.
     They are composed of stars that are all in the latest stages of their evolution.
     The stars in any particular cluster formed roughly at the same time from the same primary material and hence are approximately the same ages as each other.
     They contain an approximately equal distribution of stars of various ages.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

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The stars in any particular cluster formed roughly at the same time from the same primary material and hence are approximately the same ages as each other.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)

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