[Red Badger]

Time travel is theoretically possible, but impractical.
Suppose you actually did invent a Time Travel machine.
You get in, tune it to whatever date you want, close the door and turn it on.
What do you see through the window?
If you are lucky, nothing at all.
Why?
Because the time that you have traveled to is NOT where the Earth is at thattime. While you manipulated Time, you did not manipulate SPACE as well.
Remember, we occupy Space-Time, not just time alone.
You traversed Time, but at that same point in SPACE. So, either the Earth, and the entire Galaxy has not arrived at that point as yet, or it has passed far away.

[boop]

I've read stories like that.

Time travel, if possible, can ONLY have you going into the future, as the past already exists.

You CAN'T go back and kill Hitler, because you were born in 1967.

Kill Hitler, time changes, your parents meet or don't, you can't possibly have been conceived so you can go back in time.

Fun to think about, though.