Figure 14-10 RIVUXG A Lenticular Galaxy NGC 5866 is tilted nearly edge-on to our line of sight. Close inspection reveals a crisp dust lane dividing the galaxy into two halves centered on a subtle, reddish bulge surrounding a bright nucleus, a blue disk of stars running parallel to the dust lane, and a transparent outer halo. Viewed face on, it would look like a smooth, flat disk with little spiral structure. At a distance of 44 million ly, it has a diameter of roughly 60,000 ly—only two-thirds the diameter of the Milky Way, although its mass is similar to our Galaxy.