- #1
jhe1984
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Okay - and this is most likely a gross oversimplification - but (for galaxies thought to have DM halos), the predicted motion/predicted spin of the galaxy would be much tighter, while the observed motion (with the DM accounted for) is actually much wider?
Would this be equivalent to spinning a yo-yo above your head at one power level (representing non-dm galaxy mov't) and then adding a lot of weight to that same yo-yo (representing DM galaxy) but still spinning it at the same power level (so it now goes a lot wider and slower)?
Would this be equivalent to spinning a yo-yo above your head at one power level (representing non-dm galaxy mov't) and then adding a lot of weight to that same yo-yo (representing DM galaxy) but still spinning it at the same power level (so it now goes a lot wider and slower)?