The Flow of Time

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The mystery that is time comes from the common-sense idea that the present moment, known as “now” is not fixed, but rather it is always moving forward into the “future”. This concept is known as the flow of time. As humans, we describe the present as a single moment which allows time to appear to “flow”, essentially sweeping moments from the past to future. However, at the same time humans also want time to be a sequence of moments, with all motion and change consisting of the differences between versions of an entity at different moments. What this means is that a particular moment cannot become the present or cease to be the present. The present is not objectively a single moment. Humans think we need these two definitions of time. When we describe events we say things like “when” which implies that time is not flowing, but then when we say “why” it implies that time is flowing.
Time can be thought of as a line, “so that moments from the future sweep past the present moment to become past moments.” But if time is a line, then which point on the line is the present? Is there a present? To say that each point on the line can be thought of as a distinct moment is to say that we can think of our life as a bunch of stacked snapshots from each one of those moments. If we were a triangle on the line, constantly moving some of those snapshots would show the arrow moving and pointing in different directions because as we all know, life does not always move in the same direction. If our arrow was pointed in one direction presently, in a moment the snapshot of that arrow would be in the past. But the indication that time is a constantly moving line indicates that time flows, and time, does not flow.
If time does not flow, we have to chang...

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...re are events that are closer to you in time, and events that are further away. But, in the block universe theory time does not flow past you. It does not and cannot because there is no physical thing that can be defined as time. George Ellis, a cosmologist at the University of Cape Town, South Africa believes that the block universe theory contradicts reality. Ellis says that "It doesn't represent the passage of time, and that's one of the most fundamental features of daily life. So it's a bad model of reality." Furthermore, he said that in accepting block universe theory, attempting to understand anything about anything becomes meaningless. According to Ellis, the entire process of science depends on time moving forward. We form, test, and accept or reject a hypothesis in a process that moves through time. In human life we need time to move forward as a society.

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