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time travel

time travel

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time travel

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  1. time travel introduction

  2. External time is the ordering of events as given by an objective historian. • Personal time is the ordering of events as experienced by a particular individual. • A time traveleris someone whose personal time diverges from external time. definitions

  3. A state of affairs is practically possibleiff it is consistent with our abilities. • A state of affairs is physically possible iff it is consistent with the laws of pyhsics. • A state of affairs is metaphysically possibleiff it is consistent with the laws of metaphysics. • A state of affairs is logically possibleiff it is consistent with the laws of logic. definitions

  4. In one minute, we will have traveled into the future. • If (1), then time travel is possible. • [So] Time travel is possible. the simple argument

  5. It is possible to travel from eastern Kentucky to western Kentucky in under an hour. • If (1), then time travel is possible. • [So] Time travel is possible. the time zone argument

  6. We know that humans (homo sapiens) first appeared about 2 million years ago. • If (1), then we know that no humans appeared in the Jurassic period. • If we know that no humans appeared in the Jurassic period, then we know that time travel is impossible. • [So] [We know that] Time travel is impossible. the anthropogenisis argument

  7. There have never been any reports of time travelers appearing throughout human history. • If (1) then time travel is probably impossible. • [So] Time travel is probably impossible. the “noseeum” argument