# Why most of the galaxies are having two spiral arms only?

why most of the galaxies are having two spiral arms only?

phinds
Gold Member

why most of the galaxies are having two spiral arms only?

Yes, I agree w/ mathman. What gave you the idea that 2 arms was the norm? Can you give a reference?

I have never heard of a galaxy with only two arms, although if there was such a thing, that would be interesting to see.

phinds
Gold Member

I have never heard of a galaxy with only two arms, although if there was such a thing, that would be interesting to see.

I may be wrong, but I DO seem to remember once (and only once) seeing a pic of a galaxy with only two arms ... or it might be that it only SEEMED to have just two arms because the two were so much stronger than the others ... I can't really recall.

mathman