The arm starts near the core as the Scutum arm, then gradually turns into the Crux arm.
The region where the Scutum-Crux arm meets the central bulge of the galaxy is rich in star-forming regions. In 2006 a large cluster of new stars containing 14 red supergiant stars was discovered there and named RSGC1. In 2007 a cluster of approximately 50,000 newly formed stars named RSGC2 was located only a few hundred light years from RSGC1; it is thought to be less than 20 million years old and contains 26 red supergiant stars, the largest grouping of such stars known.
Astronomers remap Milky Way: two spiral arms not so bright, new observations show.(Atom & Cosmos)(Brief article)
Jun 21, 2008; [ILLUSTRATION OMITTED] ST. LOUIS--Astronomers are in the midst of a Milky Way makeover. New images from NASA's Spitzer Space...