CO emission from 78 WISE HII region in the OSC

The Outer Scutum-Centaurus arm (OSC) is the most distant molecular spiral arm known in the Milky Way. The OSC may be the very distant end of the well-known Scutum-Centaurus arm,...外盾牌-半人马座旋臂（Outer Scutum-Centaurus arm, OSC）是银河系中目前已知的最遥远的分子旋臂。该旋臂或为广为人知的盾牌-半人马座旋臂的极远端结构。