G'Day Rob;
Ah .. goodness me !!
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Originally Posted by Robh
Very interesting!
Wouldn't that indicate an increasing number of stars flung from the galaxy over time?
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Yes it would seem so ! It may also tend to suggest that the stars actually originated from the centre of the galaxy and this would explain the older ones being at the outer edges (??)
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Originally Posted by Robh
How does this affect the view that dark matter keeps stars in sync with the galaxy rotation?
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Yep. Good question. Dark matter is theoretical … these guys are astronomers (and they're practical types !
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Originally Posted by Robh
Also, wouldn't the rotation of the galaxy slow down as stars move further out?
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yes .. I think they've only measured the rotation velocities .. I haven't checked to see if they've modelled any of this in rotation curves. (This step involves modelling the mass distribution .. they may be leaving that up to someone else, in which case, it'll be interesting to see where this one goes !)
I'll snoop around to see if they've produced any theory updates from the observations.
Cheers