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emptypepsi · 12-26-2006, 06:49 PM

Perhaps it is possible that one can travel back in time, but not to any time prior to the construction of the time machine one is using. Some candidates for time machines, such as wormholes (hypothetical shortcuts through spacetime), imply exactly this. Or it could be that it takes great amounts of energy to travel back in time, and that the further back one wishes to go, the more energy is required. Or perhaps such time travel is in principle physically possible, but never becomes feasible, due to insurmountable technical problems. Somewhat less convincing is the possibility that visitors from the future are among us but simply choose not to reveal themselves. (Some have even said that UFO’s could be such visitors.)

12-26-2006, 06:49 PM	#4 (permalink)
emptypepsi DoubleplusgoodMod Join Date: Oct 2006 Location: Planet Vulcan Posts: 2,844 Country: Country:	Perhaps it is possible that one can travel back in time, but not to any time prior to the construction of the time machine one is using. Some candidates for time machines, such as wormholes (hypothetical shortcuts through spacetime), imply exactly this. Or it could be that it takes great amounts of energy to travel back in time, and that the further back one wishes to go, the more energy is required. Or perhaps such time travel is in principle physically possible, but never becomes feasible, due to insurmountable technical problems. Somewhat less convincing is the possibility that visitors from the future are among us but simply choose not to reveal themselves. (Some have even said that UFO’s could be such visitors.) __________________ "The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom." Isaac Asimov Last edited by emptypepsi; 12-26-2006 at 06:53 PM.