Why can’t we travel back in time?...

[DGUtley]

Why can’t we travel back in time?... If the inability to time travel were a fundamental part of our Universe, you’d expect equally fundamental physics behind that rule.

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Look, we’re not totally ignorant about time. We know that the dimension of time is woven together with the three dimensions of space, creating a four-dimensional fabric for the Universe. We know that the passage of time is relative; depending on your frame of reference, you can slip forward into the future as gently as you please. (You just need to either go close to the speed of light or get cozy with a black hole, but those are just minor problems of engineering, not physics.)

But as far as we can tell, we can’t reverse the flow of time. All evidence indicates that travel into the past is forbidden in our Universe. Every time we try to concoct a time machine, some random rule of the Universe comes in and slaps our hand away from the temporal cookie jar.

And yet, we have no idea why. The reasons really seem random; there is nothing fundamental we can point to, no law or equation or concept that definitively explains why thou shalt not travel into the past. And that’s pretty frustrating. It’s obvious that the Universe is telling us something important… we just don’t know what it’s saying.


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https://arstechnica.com/science/2021...tm_source=digg



https://www.elitereaders.com/time-travel-evidence/

[MMC]

It’s obvious that the Universe is telling us something important… we just don’t know what it’s saying......snip~


Uhm.....its saying we cant travel back in Time. Duh!

[MMC]

Why go back? I rather go forward and get that Billions of dollars with the winning ticket of the Powerball Lottery.

[Tahuyaman]

Why go back? I rather go forward and get that Billions of dollars with the winning ticket of the Powerball Lottery.

You still need the numbers. To do what you want to do, you’d need to take the winning numbers and go back in time.

[MMC]

You still need the numbers. To do what you want to do, you’d need to take the winning numbers and go back in time.

Yeah only to present time. Not way back in the past.

[Standing Wolf]

One objection that I've heard regarding the possibility of time travel to the past is that if someone in our future were going to invent or discover a way to do it, we would probably already know about it - because their appearance in our own (or a past) time would be in the news or the history books. Unless, as some have hypothesized, going back in time and changing even the smallest thing created a new "timeline". We would never know that they'd done it because at the point at which they appeared a new Earth would, in a sense, have been formed, and that person could never return to the one from which they started.

By the way, if you want to watch a truly scary movie about time travel, watch The Butterfly Effect. The stuff of nightmares.

[carolina73]

I looked up the trailer. Looks interesting.

[FindersKeepers]

One objection that I've heard regarding the possibility of time travel to the past is that if someone in our future were going to invent or discover a way to do it, we would probably already know about it - because their appearance in our own (or a past) time would be in the news or the history books. Unless, as some have hypothesized, going back in time and changing even the smallest thing created a new "timeline". We would never know that they'd done it because at the point at which they appeared a new Earth would, in a sense, have been formed, and that person could never return to the one from which they started.

By the way, if you want to watch a truly scary movie about time travel, watch The Butterfly Effect. The stuff of nightmares.

Yes, The Butterfly Effect was powerful.

[RMNIXON]

Time Travel is Real because Einstein proved you can indeed go forward in time relative to other observers all you want. You just can't go back in time.

I am no physicist of course but I do follow the subject. And I recall reading that a particle that goes even a little back in time causes problems in terms of physics, so it is not just the paradox of causality like in the "Back to the Future" movies where you alter past events.

[Captdon]

The past no longer exists. The future hasn't happened.