Irregulars question: Milky Way

[Alberto Monteiro]

[BTW, is it "Milky Way" or "Milky-Way" ?] 
 
What is the width of a spiral arm? 
 
<maniac>  
Using a pitch of 12 degrees, then if we 
suppose that Trantor and Terminus are in the 
same spiral arm, then Earth could be placed in 
the Terminus-Trantor line - at the other side of 
the Galaxy 
</maniac> 
 
Alberto Monteiro 
 
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