**Astronomers update our galaxy's structure Teams of astronomers
studying the Milky Way using infrared and radio waves presented an
updated view of our galaxy's structure June 3 at the American
Astronomical Society meeting in St. Louis. Among the findings is the
discovery of a long suspected inner spiral arm and recognition that the
Milky Way contains two main arms, rather than four ... Read more.

http://www.astronomy.com/asy/default.aspx?c=a&id=7039