When Einstein merged the idea of space together with the idea of time, he discovered the “space-time” construct that is pivotal to understanding how our world works. In doing so, he also discovered something else quite significant: the illusion of time.
In other words, Einstein realized that what we perceive as distinctly separate moments in time — that which we call the past, present, and future — are actually all existing at once in one eternal “now.” In other words, the past is real and happening now, even though we perceive that it already happened. And the future is real and happening now, even though we perceive it as not having happened yet.
This concept can be kind of a mind-bender at first, but the construct of space-time and the laws of physics dictate that this is the truth. It has to do with Einstein’s theory of the effect of motion on the passage of time, which was scientifically proven in an experiment in 1971.
Scientists placed an atomic clock in an airplane and flew it around the world. Afterward, when compared to a clock it had been matched with on the ground, it was found that the clocks no longer matched. The difference was only a few hundred billionths of a second, but it nonetheless proved motion’s effect on time, and eventually the illusion of time itself.