Larni writes:
Does the universe contain regions that cannot have any interaction with each other?
If objects are so far apart that the recessional velocity is greater than the speed of light, no new info can be exchanged between the objects. But since the universe expanding at an accelerating rate, light that left one object in the past may still reach the other object even if the objects are too far apart for continued interaction.
Larni writes:
I was wondering about the expansion of the universe and how things seem to be getting father apart (on the very macro scale); would we ever get to a point where every particle in the universe was so far from every other particle that there would be zero interaction and it got me thinking if this could be happening with regions of the universe.
Perhaps, but I don't believe this could be happening right now. Expansion happens on a cosmic scale and things that are bound together by gravity or stronger forces are showing essentially no expansion. Maybe if the expansion accelerates to some huge quantity in the future, all matter will get ripped apart and separated beyond the point of no interaction.
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