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Recent work suggests the arm does not exist |
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[[Image:Milky_Way_Spiral_Arm.svg|250px|right|thumb|Observed structure of the Milky Way's spiral arms]]
The '''Sagittarius Arm''' (also known as ''Sagittarius-Carina Arm''; labeled "-I") is genrally thought to be one of the [[spiral arm]]s of our home [[galaxy]], the [[Milky Way]]. Each spiral arm is a long, diffuse curving streamer of [[stars]] that radiates out from the [[galactic center]]. These gigantic structures are often composed of billions of stars, and Sagittarius is one of the largest arms in our galaxy.
The Milky Way is a [[barred spiral galaxy]], consisting of a central crossbar from which several spiral arms radiate outwards. The Sagittarius Arm's innermost end connects to one of the ends of this central bar, making it one of the two major spiral arms of the galaxy. The other large arm is the [[Cygnus Arm]].
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The Sagittarius Arm is divided into two parts. Curving outward from the galaxy's central bar is the Sagittarius Arm (Sagittarius bar), which further outward becomes the Carina arm.
==Does the arm exist at all?==
Recently it has been suggested that the Sagittarius Arm does not exist at all and is simply a concentration of gas and newly formed stars [http://space.newscientist.com/article/dn14057-two-of-the-milky-ways-spiral-arms-may-be-demoted.html?feedId=online-news_rss20].
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