The most detailed ever map of the Milky Way shows that our galaxy is not flat. It turns out the disc is warped into an S-shape
Source:
https://www.newscientist.com/article/2212350-best-ever-map-of-milky-way-shows-our-galaxy-is-warped-in-an-s-shape/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home