1. 
   Sb galaxy
   (from the article `galaxy`) This intermediate type of spiral typically has a medium-sized nucleus. Its arms are more widely spread than those of the Sa variety and appear less ...
   Found op http://www.britannica.com/eb/a-z/s/38
   
   
2. 
   SB0 galaxy
   (from the article `galaxy`) There are SB0 galaxies that feature a large nuclear bulge surrounded by a disklike envelope across which runs a luminous, featureless bar. Some SB0 ... ...and barred spirals, denoted SB. In addition, there exists a transition type between ellipticals and spirals, which ar...
   Found op http://www.britannica.com/eb/a-z/s/38
   
   
3. 
   SBa galaxy
   (from the article `galaxy`) ...runs a luminous, featureless bar. Some SB0 systems have short bars, while others have bars that extend across the entire visible image. ...
   Found op http://www.britannica.com/eb/a-z/s/38
   
   
4. 
   SBb galaxy
   (from the article `galaxy`) ...external to the bar. SBa galaxies have bright, fairly large nuclear bulges and tightly wound, smooth spiral arms that emerge from the ends of the ...
   Found op http://www.britannica.com/eb/a-z/s/38
   
   
5. 
   SBc galaxy
   (from the article `galaxy`) ...or near the ends of the bar, with conspicuous dust lanes along the inside of the bar that can be traced right up to the nucleus. Others have arms ...
   Found op http://www.britannica.com/eb/a-z/s/38
   
   

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