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Great Square of Pegasus constellation. Optical image of the Great Square in the northern constellation of Pegasus. The square, which represents the body of the winged horse Pegasus, is formed by four stars: Alpha (Markab, lower right), Beta (Scheat, upper right) and Gamma Pegasi (Algenib, lower left) and Alpha Andromedae (Alpheratz, upper left). (KEYSTONE/SCIENCE PHOTO LIBRARY/JOHN SANFORD)