3 ms·

This argument only put some restriction on the kind of time machine you can have : If your time-machine can follow a continuous path through spacetime between A

This argument only put some restriction on the kind of time machine you can have : If your time-machine can follow a continuous path through spacetime between A and B, there is no more problem. The time-machine applies position correction at every instant while moving backward in time. This allows you to work in a relative time-position instead of absolute time-position. That is why you can't go in-out of fort Knox Vault stealthily with a time-machine without at some point in time having to go through the door.

NumberCruncher 5y ago
> If your time-machine can follow a continuous path through spacetime between A and B, there is no more problem. Nope, there are still some problems. It's not enough to be at the right space (=coordinates) at the right time, but you have to have both the right speed-vector and the right-acceleration vector, both compared to the universe (otherwise the milky way moves away from under your feet with galactic speed) and compared to your body (otherwise the speed/acceleration change will rip your body apart). And with right I mean 100% right, because we are talking about galactic speed and acceleration.