Number 147 (Story #2), October 13, 1993 by Phillip F. Schewe and Ben Stein AN ACTIVE GALAXY'S CENTER AND ITS NUCLEUS do not always coincide. E. Mediavilla and S. Arribas, astronomers working in the Canary Islands, report that two-dimensional spectra of the Seyfert galaxy NGC3227 reveal the galaxy's nucleus---identified in the spectral map as being that area with intense broad emission lines, indicative of high-velocity gas moving under the presumed influence of a supermassive black hole---is offset from the galactic center by about 750 light years. The astronomers offer several explanations: the displacement may have resulted from the merger of two galaxies or the black hole, if one is there at all, may be orbiting some concentration of dark matter. (Nature, 30 Sept. 1993.)