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Open cluster extravaganza

Roam through the various classifications of these easy-to-observe objects.
RELATED TOPICS: OPEN CLUSTERS
NGC 2506

In the February 2014 issue, I wrote a three-page story titled, “Explore the Trumpler classes of clusters.” In a famous published in 1930, Robert Julius Trumpler created a way to catalog various open stars clusters, starting with four main groups:

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