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Most Globular Clusters where formed at or before the formation of the Galaxy so the Stars are all old stars.
the Stars in Globular have a low abundance of the heavier elements than Helium, and as such are the same age as the Galaxy(around 12 billion years give or take a few million)
Most Open Clusters area lot younger, such as the Pleiades which is only about 50 million years old.
Ron
Last edited by astroron; 27-12-2008 at 12:03 AM.
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