30% of the stars in the Milky Way have moved a long way from where they were "born." That's a lot - and it says a galaxy is a dynamic and ever changing thing, not some static arrangement of stars as we might think it is.
For the most part, stars are moving in and out in relation to the galactic core. Given how inhospitable the galactic core is, this may say something about the chances of intelligent life, unfortunately.
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