Contacts  |  CfA Home  |  HCO Home  |  SAO Home  |  Intranet    About  |  Research  |  Education & Outreach  |  Facilities  |  Opportunities  |  Events  |  Press Room    Resources for . . . Scientists Software Users The Public Educators & Students Amateur Astronomers CfA Staff (Intranet)
CfA Press Releases Weekly Science Updates 2013 2012 2011 2010 2009 2008 2007 2006 Other News Features All News	Weekly Science Update Ultra-luminous X-ray Sources The ring galaxy NGC 922 as seen in the optical. X-ray studies have discovered twelve Ultra-Luminous X-ray sources in this galaxy - an unusually large number. Credit: David Malin Low Resolution Image (jpg) Back to Science Update
About |  Research |  Education & Outreach |  Facilities |  Opportunities |  Events |  Press Room |  Contacts |  Support SAO |  Privacy |  SI Terms of Use   SMITHSONIAN ASTROPHYSICAL OBSERVATORY  |   60 GARDEN STREET  |   CAMBRIDGE, MA 02138