6
Types of Galaxies  (pg. 254-255)
•Spirals
–      Sa                   Sb              Sc
   (large nuclei      Þ  small nuclei)
 (little gas,dust    Þ lots of gas, dust)
–
–     SBa                SBb            SBc    (as above, with BARS)
•
•Ellipticals
–E0  E1 E2 E3 E4 E5 E6 E7
(spherical)               (highly elliptical)
–
•Irregulars