Each spiral arm has a thickness of up to 2,000 lightyears.
These observations are best interpreted as a magnetized outflow driven by star formation in the central 640 ly 200 pc of the Milky Way.
However, observations of this region of the local universe are difficult because it lies past the direction of our galactic center, which obscures our view.
If we were to travel inwards towards the city center we would find the Scutum-Centaurus and Norma arms.
Paul received his PhD in Physics from the University of Illinois at Urbana-Champaign in 2011, and spent three years at the Paris Institute of Astrophysics, followed by a research fellowship in Trieste, Italy.
Still, when is not significant, the dusty ring of the Milky Way can be discerned in the night sky.