The local spiral arm of our Galaxy, also called the Orion Spur as it is a partial arm located between the larger Sagittarius Arm and Perseus Arm. The Sun lies near its inner edge, that is, towards the galactic centre. All the main naked-eye stars are part of the Orion arm, including those of Orion itself. The arm stretches towards Cygnus in one direction, and towards Puppis and Vela in the opposite direction. Features in the Orion Arm include the Gum Nebula, the Orion Nebula, the North America Nebula, the Cygnus Loop, and the Great Rift.
Subjects: Astronomy and Astrophysics.