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Because according to the big bang theory, that determines the future of the universe:

  1. Big crunch, collapse
  2. Flat universe, smooth expansion forever
  3. Continuing accelerating expansion

However recent observations suggest that about 3 billion years ago the expansion began accelerating. If it continues accelerating at this rate at some point in the future every subatomic particle will be carried so far from every other one it will be impossible for any of them to interact with any other in anyway. The cosmologist have given the supposed cause of this acceleration the name "dark energy".

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∙ 15y ago
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What else can I help you with?