Quote:
Originally Posted by GGG
The simplest way to state it is that general relativity does not prohibit geometries of space time that permit time travel.
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This nuance is very important. Not being prohibited by General Relativity is not the same as being practically possible.
I agree with others that we really know very little. The more we learn, the more questions come up and the more we become aware of how incomplete our knowledge is.
I look at gravity as an example. Gravity has been known to be a scientific fact for centuries, but the more we have learned about it, the more complex the theory has become and we realize now that something which at one time seemed relatively simple, is in fact very complicated and not 100% understood. General Relativity is not complete. It's reliable and when tested, shows little to no deviation from Einstein's predictions and calculations, but there are still other things going on.