No, I'm certain that I mean there is a supermassive black hole at the center of each galaxy. The one at the center of the Milky Way is known as Sagittarius A*. It's a relatively recent discovery, but most astronomers are convinced.
http://www.spacetoday.org/DeepSpace/...lackHoles.html
http://www.spaceref.com/news/viewpr.html?pid=17854