Quote:
Originally Posted by Penforhire
Steve, wait, have we talked yet about how time travel SF is really fantasy?  Actually reading The Doomsday Book right now and it brings that thought to mind. We have no scientific basis I've seen for actual physical travel (my body goes there) into the past. So why isn't time travel categorized as fantasy? |
Actually, we have no experimental basis for going back in time, but we do have a scientific basis. According to Einstein, pretty much every method of FTL travel allows traveling backwards in time for at least some inertial reference frames.
Now a bunch of theoretical physicists (probably because they are afraid they might at some point go back in time and become their own grandparents, or other such silliness
), conjecture that the Universe will have some feedback mechanism that will destroy any actual attempts to travel in time (and therefore to violate causality), but that is all it really is, conjecture since causality is merely assumed to exist and has never been proven.
--
Bill