The Far 3 kpc Arm was discovered in 2008 by astronomer Tom Dame (Harvard-Smithsonian CfA), while preparing a talk on the Galaxy's spiral arms for a meeting of the 212th American Astronomical Society. It's one of Milky Way's spiral arms and it's located in the first galactic quadrant at a distance of 3 kpc (about 10,000 ly) from the galactic center.