Please go over whatever thermodynamics law states about entropy and arrow of time nd other shiz. I saw someone explanations online…did not understand it
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The real question here is what is time. We don’t know. In the way we understand the world, there is a thing we call “causality” and we postulate that the whole universe abides by it. And by this causality we can reason and explain “everything” so far.
This causality thing though needs stuff to be ordered (first A happened, then B followed, then C , …). And now you have time. And since we haven’t seen causality go the other way (broken vase -> vase), we say time doesn’t go the other way either.
And it turns out that time works really well in order to explain things, because since Einstein we’ve added it with space and we got spacetime.
IN PHYSICS – there is no special reason. Our understanding of the universe says a ball can roll left to right or right to left, the same physics says time goes left to right or right to left.
As u/johnkapolos says – “what *is* time?”
The only way we can really describe time in physics is “it’s a one way thing”, like a ball rolling down a hill. The ball can’t magically jump back up and return to where it started (without someone “outside” picking up the ball and replacing it).
I won’t bore you with thermodynamics but the *only* other place we see something “one way” like this has to do with heat. Heat always flows in one way unless someone “picks it up and puts back where it started”. That’s the only thing we see in physics that works like time is heat so we *think* time and heat must be related and what you and I think of as “the passage of time” is really “the passage of heat”, but that’s getting sorta philosophical.
Won’t the universe constrict eventually back to a point or bang?
Yes, I do not believe time is simply sequentially linear (redundant there?) like we want to stuff it into. There are so many directions it can go into. Like every dot possible in a (expanding?) circle. Makes me so believe in endless universes (not necessarily parallel, lol).
Think of time travel like reloading a game save after dying to a boss. Chronologically you will have always died, you can never subtract that, but you can add the data from a previous save to the current chronology.
The fundamental data constructing reality within the game is changed to be identical, or as identical as necessary considering games often don’t save everything, to the reality within the game midst the save.
The data will always have been changed to reflect reality in the past, the data will never have been unchanged in its entire chronology. It may look like it’s the past but it’s a clever illusion intentionally placed there for immersion.
To reload a save in real life would be to enact a replica of the past, an illusion. The fabric of reality would shift to replicate the past, but the fabric will always have shifted when it did. The data’s chronology is constant.
For starters, you have to realize that what most people call “Time” is really just a recognition of change. There isn’t some kind of force of time. It doesn’t really exist. What we are observing is simply change. You don’t need another force, dimension , or entity for change to happen. We can see how change happens as physics happens. So if there is no time, then there is no direction of time. There is no backward or forward. These are constructs of our minds so that we can give relevance to events. For example. Yesterday at 8:00 am, the universe was configured a certain way. Right now it is configured differently based on the laws of physics. Yesterday no longer exists and tomorrow doesn’t exist either, they are simply our recognition that the laws of physics happen and the universe will be in different configurations as physics progresses. So why doesn’t the universe run backward? There is no backward nor foreword. We made all that up. Thermodynamics and entropy are rules of the universe and that is how things change period. Things can’t run backwards in the way you view that because that’s not how physics work.
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