Every microsecond ( !X 10^-3 second ) there are trillions of sunrises in the universe, never that one of them returns again, that is because the universe is running forward, and time does not return back.

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• https://en.wikipedia.org/wiki/Arrow_of_time
  Arrow of time - Wikipedia, the free encyclopedia
• https://en.wikipedia.org/wiki/Time
  Time - Wikipedia, the free encyclopedia
• https://upload.wikimedia.org/wikipe...Lorentz_transform_of_world_line.gif