The Structure of our Galaxy
					� The Disk Component � Stars, gas, and dust � The spiral arms � Size: � Luminous Diameter ~ 25 kpc � Thickness 300 pc � 1 kpc O stars and dust 30 pc Sunlike stars greater � The Spherical Component � Old Stars, but little gas or dust � The Halo � Globular clusters � Isolated old stars � red dwarfs, giants, white dwarfs � The Nuclear Bulge