Main Page | See live article | Alphabetical index M100, the 100th object on the catalog of Charles Messier, also known as NGC 4321, is a spiral galaxy located 17 Mpc from Earth. The galaxy has a diameter of 36,800 parsecs and is one of the brightest members of the Virgo cluster of galaxies. See also: Messier 100, SEDS Messier pages This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.