New infrared images of the Milky Way show just two major spiral arms, Scutum-Centaus and Perseus, along with a newly discovered arm called Far 3kpc Arm.
左边是银河系的目前结构，显示其两条主螺旋臂，右边是较早的银河系图像，有四条主螺旋臂。
The finding suggests that Scutum-Centaurus wraps all the way around the Milky Way, making it a symmetric counterpart to the galaxy's other major star-forming arm, Perseus.
该发现表明，长形盾半人马座臂完全“围绕”着银河系，从而使得这个螺旋形“巨大手臂”与银河系中另一个由行星所形成的主要“手臂”——英仙臂相对称。
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