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Do you think in the future we will have the technology to travel in time?

Say 300-500 years from now, if we dont extinct ourselves by then, could we have the knowledge to time travel? Look at how far we've advanced in technology in the last 50 years and the rate that it is increasing...
If so, then do we have people walking around from the future right now? They'd probably be smart enough to know not to change anything...
What about aliens? Could they be our future smarter selves? Maybe our earth becomes inhabitable so the elite humans get to inhabit this new planet with new laws of gravity so their body has less mass, which is why aliens are described as skinny. The reason we cant find them is because in our time, they dont exist, but maybe in 500 years we've colonized the moon or something and learn new laws of physics which dont exist on earth which is why we dont have that technology yet.
Am I crazy?

Well, there are big logical flaws in the concept of time travel.

Travel backwards in time is logically impossible. Simply because it's impossible to be present in another time in the past without affecting your own future (however hard you try). The simple fact of chaos theory ensures that however little you perturb the status quo you will end up with massively amplified effects which will end up not only changing your own future, but that of the whole world.

As to travel into the future, I'm not so sure but I think you would have the same problems. If you go to the future your absence from your present would necessarily alter your future so that unless you were to return to the present at the exact timepoint at which you left, the future you visited would no longer be the future you have in store (phew! what a sentence).

The theoretical way around these problems would of course be to take account of multiple universe theory (the so-called "many worlds interpretation" of quantum mechanics). If you could travel in time but not within your own universe then the above logical contradictions would not hold. However, that then bounces up against the problem that the many-worlds-interpretation asserts that the multiple-universes are non-communicating. So time travel would violate that.

As to whether you're crazy... not at all. Everything should be open to discussion.

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