Is it possible for a galaxy too fall back into its self?(even if they don't) What would happen? :grumpy:
Are you sure about that? In http://math.ucr.edu/home/baez/end.html I read:LURCH said:So, the same force that caused the galaxy to "clump together" into a galaxy in first place is still pulling that galaxy ever tighter together.
And you can show in the really long run, any isolated system consisting of sufficiently many point particles interacting gravitationally - even an apparently "gravitationally bound" system - will "boil off" as individual particles randomly happen to acquire enough kinetic energy to reach escape velocity.