The Answer is a Prime Number

Photographer: Greg Parker
Summary Authors: Greg Parker, Jim Foster

Which double-digit prime number will evenly divide into 111, 222, 333, 444, 555, 666, 777, 888, and 999? If you zoom in on the little open cluster above (click on the image to enlarge), in the center of this field you'll discover the answer. This is the 37 Cluster. This curious shaped, open cluster (NGC 2169) is found approximately 3,600 light-years away in the direction of Orion the Hunter.

Image acquired in early January 2009 by Greg Parker at the New Forest Observatory (U.K) and processed by Noel Carboni in Florida.

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