New measurements suggest redesigning the shape of the Milky Way galaxy
HI broadcast as a function of LSR radial velocity and galactic longitude. Colored dots are HMSFR masers with parallax measurements: Norma Arm (orange), Sagittarius Arm (cyan), Carina Arm (green), Local Arm (blue), Perseus Arm (magenta) and Outer Arm (red). White dots indicate spurs or springs for which arm assignment is unclear. The HI broadcast comes … Read more