Causality is just determinists starting with “time travel is impossible” and finding a fancy name for it.

I don’t want to say they’re wrong, just that asserting casualty in a discussion about time travel being impossible is kinda like asserting Godwin’s Law in a discussion about whether or not Trump’s a nazi.

So, I’m going to put it this way. I entirely agree. But I’ll be slightly more open minded and say it’s extremely unlikely. I mean 0.many zeroes point 1 percent likely. Winning the lottery every day for your entire life likely.

However, when it comes to physics. We only ever have an understanding through the narrow windows with which we can see the universe. We have a set of rules that seem to very well tally with the universe we observe and they’re very likely all or almost all correct.

But our understanding does change all the time, it’s not outside the realms of possibility we’ll prove it is possible and not feasible or even possible. I will not hold my breath though.

I’d also argue that causality doesn’t need to be a problem. It all depends on how we imagine traveling through time would work. If we imagine that one experienced time line is an closed loop. Then you could effect the future without destroying the entire universe on another timeline. It would just be like reversing down the track and flipping points. Now you cannot access that other track. But it still exists, and everything on that track still exists.

In that way, if I went back in time and changed some significant event in history then went into the future, I would see a different future, according to the change I effected. But my personal timeline would still include the time I spent in the time before I changed it. Therefore I’ve not changed my own past. Only my own future.

My point being that while time travel will never be a thing we see, the causality issue is just a lack of imagination problem :P

Realtivistic time-dialation says otherwise.