M100 and NGC4328


M100 (NGC4321) is an Sc-type spiral galaxy in the constellation Coma Berenices.  This galaxy, which is part of the Virgo Cluster of galaxies, is at a distance of approximately 56 million light years according to Hubble Telescope observations.  More information and additional images of this galaxy can be found at the Messier Index - M100.  

The small round galaxy at the lower right-hand edge of this image is NGC4328.  This galaxy is believed to contain a supermassive black hole with a mass of 40 million solar masses (Cowen, R.; "New Evidence of a Galactic Black Hole," Science News, 147:36, 1995).  

 This is an 11.3-minute composite image from 34, 20-second exposures taken on 28 June 1997.

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