“The structure of the Milky Way is very hard to assess, because our Solar System is located inside the plane of our galaxy structure,” Skowron says. “We know now that this is a spiral galaxy, and this has been inferred, among others, from our extrapolation of structures seen in other galaxies.”
https://www.youtube.com/watch?v=oFzqhYN-Lig&feature=youtu.be