Arm (cosmographic terminology)

== Introduction ==
In galactic cosmography, an arm is a curved collection of gravitationally bound stars that eminate from the center of a spiral galaxy. These arms can also have spurs, or collections of stars that jut out from a primary arm. One of the most well known galactic arms is the Orion-Cygnus Arm, which is where the planet Earth is located. 
== Appearances ==
* None
Category:Cosmography