Published:
January 24, 2011
 All the stars in a tiny region around the Southern Hemisphere globular cluster NGC 6397 are shown at left. Astronomers then plotted just those stars with proper motions similar to the globular cluster stars, shown at right. Using such a method shows a clear difference between the stars associated with a cluster and those that happen to lie in the same region. Astronomy: Roen Kelly, after Harvey B. Richer, et al.
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