Sme theorists in science and philosophy believe that time is an illusion—that it does not exist. Since the time of Aristotle, it has been held that if no one perceives time, then it does not exist. For time to exist, there must be a consciousness to register it.
For Immanuel Kant, time is an *a priori* concept. For Albert Einstein, time is simply another dimension of space. He believed that time and space constituted a single four-dimensional structure; in doing so, he stripped both time and space of their independence. Theoretical physicist Julian Barbour believes that time does not exist; he even goes so far as to suggest that motion itself is an illusion. However, the truth is that time *does* exist.
If time did not exist:
1- Change (or "becoming") would not exist.
2- Everything would have already happened.
3- Velocity would not exist either, since velocity is equal to distance divided by time—that is, v = d/t.
In the equations of physics, time seems to vanish; it does not appear to flow. Yet, reality differs from what those equations predict.
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