Read the report at [Sci-News](http://www.sci-news.com/astronomy/science-milky-way-galaxy-four-spiral-arms-01649.html). In the mean time, here’s an illustration to whet your appetite:
Read the report at [Sci-News](http://www.sci-news.com/astronomy/science-milky-way-galaxy-four-spiral-arms-01649.html). In the mean time, here’s an illustration to whet your appetite: