Re: I take objection to NASA's Mars plans!



Allen Thomson wrote:


And vice versa. STR says FTL -> backward time travel with all
of the causality worries that brings. Sum'pin to think about.




Also, if someone had invented time travel in the future, and they traveled back in history and change something, then that particular future where the time machine got invented ceases to be.
So let's hope no one in our particular timeline invents one and goes back in time to before we were conceived, or a different sperm cell may fertilize mom's egg cell, and the "we" that is the "we" that is ourselves doesn't exist anymore.
In short, if someone invents time travel in the future, then the whole present population of the world, and not just their mothers, may be screwed. =-O

Pat
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