As I see it, after the big bang the universe was expanding into 'nothing' as 'nothing' cannot provide any resistance. If gravity is the only force slowing down the expansion and as it gets weaker with distance, it stands to reason that the expansion of theUniverse will therefore accelerate over time. If Einstein is right then at some point the expanding universe will get close to the speed of light. At this terminal velocity if the only force left is gravity, it follows that the Universe will slow and eventually contract.
Any thoughts?
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