Mike Williams nous apporta ses lumieres en ce 2005-07-17 01:46:
> Wasn't it Tek who wrote:
> 
>>I don't know much about what's actually out there so any 
>>suggestions would be welcome.
> 
> 
> One thing I do know about spiral galaxies is that they only have two
> arms. There are a few galaxies that look like they might have more, but
> it's probably an illusion.
> 
> We don't understand why galaxies have spirals, but it is conjectured
> that the dual nature of the spiral might originate from some compact
> body that emitted two powerful jets in opposite directions. 
> 
Spiral galaxies comonly have more than 2 arms, and they often split into more arms.

Alain

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