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A bit of insulation is not going to stop a species that can travel between the stars.
If the home star is over crowded and it is a shorter distance to an interplanetary body than another star then it could be an appealing option. Especially if it was rich in heavier elements.
While there is going to be very little heat on these planets, every single atom on them bundles up a lot of energy.
I don't see why aliens of sufficient technological ability couldn't inhabit a nomad indefinitely - as long as they evolved elsewhere.
Unless you have already given up and you are just waiting for the day it completely falls apart.
Thankfully I did all that before I checked slashdot.