Two of the Milky Way's Spiral Arms go Missing NASA Press Release 6-3-2008 http://www.nasa.gov/mission_pages/spitzer/news/spitzer-20080603-10am.html Revised structural map http://www.nasa.gov/images/content/236084main_MilkyWay-full-annotated.jpg Basically they are proposing (reminiscent of the Pluto planetary debate) to downgrade the Orion-Cygnus Arm from a "major arm" to a just a "minor arm". Peace - Kurt P.S. - This was released at a press conference at the current AAS meeting in St. Louis - no published journal paper. The focus of this year's meeting is preparing for public education for next year's 400th Galileo anniversary. See - "Preparing for the Internationl Year of Astronomy Workshops" in the meeting schedule at http://www.aas.org/meetings/aas212/schedule.php