I have decided time travel will not work. Let’s say you jump one hour into the future. The earth will have moved, as will have the solar system around the galaxy, and for that matter, the galaxy itself. You’d materialize in space.
The same would happen going into the past.
As fun as it is to engage in thought experiments in which you meet dinosaurs, or Morlocks and Eloi, in reality it can’t happen.
As I’ve pointed out before, teleportation or those Star Trek transporters, wouldn’t work. If you were beamed down on the equator you’d end up a red streak since the earth is spinning about 1000 miles an hour.
It appears this space-time continuum stuff prevents us from teleportation or time travel. It’s too bad.
Still, there’s always those Stargates. I hope they work.