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I only minored in pseudo-science but time travel seems to be a practical impossibility due to the spacial displacement problem. If by some incredible super-science you were to discover how to travel backwards in time (we already know how to travel into the future of course) and moved backwards only a few hours you would (theoretically) wind up in the empty space where the earth was at that time. A time travel machine would have to simultaneously be a space travel machine with an incredibly sophisticated navigation scheme and an unlimited supply of power. Like a flying saucer for example. [cough, cough] Never mind.

[QUOTE="trainedobserver, post: 111234, member: 2192"] I only minored in pseudo-science but time travel seems to be a practical impossibility due to the spacial displacement problem. If by some incredible super-science you were to discover how to travel backwards in time (we already know how to travel into the future of course) and moved backwards only a few hours you would (theoretically) wind up in the empty space where the earth [I]was[/I] at that time. A time travel machine would have to simultaneously be a space travel machine with an incredibly sophisticated navigation scheme and an unlimited supply of power. Like a flying saucer for example. [cough, cough] Never mind. [/QUOTE]

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