02 February, 1998. Evidence for massive black holes at the centers of galaxies continues to build. Velocity measures by the Hubble Space Telescope indicate a black hole in the galaxy M 84 in the Virgo cluster with a mass 300 million times that of the Sun. A close-up image of the nucleus of NGC 6251 seems to show a bare black hole whose immediate surroundings are illuminating a surrounding orbiting disk.