Time has historically been closely related with space, the two together comprising space-time in Einstein's special relativity and general relativity. According to these theories, the concept of time depends on the spatial reference frame of the observer, and the human perceptions as well as the measurement by instruments such as clocks are different for observers in relative motion. The past is the set of events that can send light signals to the observer; the future is the set of events to which the observer can send light signals.
Returning to the discussion of visible universe, consider this concept in measuring the size of our universe: we can only see as far as light can travel. So maybe this space-time mumbo jumbo isn’t so incorrect after all.
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