Astronomers initially thought that the halo was small and light, indicative of a spiral galaxy, but Spitzer found that halo around the Sombrero Galaxy is larger and more massive than previously thought, indicative of a giant elliptical galaxy.
The halo was small and light. This was indicative of a spiral galaxy. Astronomers initially thought this. Halo around the Sombrero Galaxy is larger and more massive than previously thought, indicative of a giant elliptical galaxy. Spitzer found this.