Is time travel Impossible Because time Doesn't Exist?

[Anomalocaris]

How do you know it is impossible for you to visit dinosaurs in reality?

Because they don't exist anymore?

Circular reasoning.  You assume time travel is impossible, deduce, without proof, from that it is impossible to visit live dinosaurs from the past, then use that unproven deduction that one can never visit dinosaurs from the past to support time travel being impossible.

Obviously, perception of backward time travel is not an frequent  occurrence readily discernible in everyday lives.  But that doesn't prove it is directly or indirectly prohibited by the underlying laws governing how the universe behave.   As relativity and quantum mechanics have shown, how energy, space and time work at a fundamental level if far different from how it might appear through casual observation in mundane environment.

I believe all but one known laws of physics works exactly as well with time going either forwards or backwards.  Only law of increasing entropy seems to specify a preferred direction in time.  But I believe entropy increase is only descriptive of statistical correlation between system behavior and passage of time.   It doesn't fundamentally address the nature of time, and why time in one frame seem to move at different rates From another frame.   I think it also doesn't really prohibit the apparence of decreasing in entropy in one frame from the perspective of time of another frame.

Now Alex will tell me where I am right or wrong.