Dr. Mark J. Reid, Senior Radio Astronomer at the Harvard-Smithsonian Center for Astrophysics, has been involved in research that has recently determined that the Milky Way is actually much bigger than previously thought.
Mark J. Reid,http://www.cfa.harvard.edu/~reid/
365 Days of Astronomy March 18th: Milky Way Just Got Bigger,http://365daysofastronomy.org/2009/03/18/march-18th/
arXiv.org: Mark J. Reid,http://arxiv.org/find/astro-ph/1/au:+Reid_M/0/1/0/all/0/1