Time. It is everywhere, we cannot stop it, make it go faster or influence it in any way. It just runs its course no matter if we want it or not. Have you ever noticed that we know so little about time although it conditions our lives in so many ways?
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| We can't stop time, and it ticks the same for everybody. We can decide, though, what we'll do with the time given to us. |
I dare say time may be the biggest mystery of science. We can measure it but it is hard to define what exactly time is. In the same manner, it is impossible to establish what time it is now. When it comes to human time, there have been and still are a lots of calendars, different depending on a culture. It is 2011 in Georgian calendar, 5771-5772 in Hebrew calendar, and 7519-7520 in Byzanthine calendar, to name just a few. How do we know which system is correct? Anyways, the calendars are just a matter of convention.
Cosmic time may be seen as a slightly different thing. Although scientists can estimate how old our universe is, it is hard to say if time started ticking with the Big Bang or if it had existed even before our universe came into being.
Such mind-buggling questions require loads of imagination. It is difficult enough to picture a 'time' when nothing existed, so envisioning a 'time' without time is just too challenging.
The greatest physicist, Albert Einstein, described time as a part of space-time continuum. A fabric with intervowen threads may serve as a model of this contiuum where two dimensions, time and space, intersect and complement each other. According to this theory all past, present, and future events are already there, they all have already happened. Our experience depends on where in the continuum we are in a given moment.
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| According to Einstein's Theory of Relativity, matter bends the fabric of spacetime. |
Such a deterministic approach may put us down a little bit. If the future is already mapped out for us, what is the use in my trying?
Quantum physics offers help there offering a different theory of time. There is an infinite number of versions of a single event, just as there is an infinte number of electron positions in a given moment. It gives endless possibilities of any event, or action.
The latter theory gives hope. If nothing is set in stone, every decision we make may (theoretically!) turn up million possible ways. Isn't that fascinating?We can't even expect what the future holds in stock for us.
Let's enjoy the exploration of the unknown, wonderful world.
P.S The post is inspired by the documental "Brian Cox explains what time it is" Forgive my lack of scientific insight and possible errors.