The Answer is a Prime Number

April 01, 2009

040109_prime_number

Photographer: Greg Parker, More Photos from Greg
Summary Author: 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 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 (U.S.A.).