METROPOLITAN SKIES
By Dave Trapani
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Many stars occur in associations called "star clusters". Astronomers divide star clusters into two
broad categories: Open Clusters (also called Galactic Clusters), in which there are a few (typically
tens to thousands of) young stars and individual stars are easily resolved, and Globular Clusters,
which are much older, contain many more stars (typically 100,000 to 1,000,000), and in which the
central density is sufficiently high that we cannot resolve individual stars from earth-based
telescopes (hence they appear as a "glob" of light).
© 2008 David A. Trapani
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