Which is a bit tongue in cheek, but I don't see how you can speak so concretely about it without having a working time machine.
Because the laws of physics are what they are. A time machine would have to fit inside those laws.
This constrains the design of the time machine - you can't just do anything you want.
Because of that, it's possible to narrow down how a time machine would work, if it could work.
Because the laws of physics are what they are. A time machine would have to fit inside those laws.
This constrains the design of the time machine - you can't just do anything you want.
Because of that, it's possible to narrow down how a time machine would work, if it could work.