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Yes, S for spiral, and usually 3 subdivisions a, b, c.  a has the more prominent centra and tighter spiral arms.

Jonathan Ratty on 15 May 2006 at 22:39 +0000 wrote:
Hi,

I'm also sitting here with Starry Night running.  It tells me that M61 is a 'Spiral Sb Galaxy' - is that a sub-classification of spiral galaxies?  

I think I've learned something already...

Jonathan Ratty