So if the first wormhole time machine were built in the year 3000, there could not be any time tourists in the year 2000. Only if wormhole time machines already exist in nature-or were made long ago by an alien civilization-could we visit epochs before the present. But you couldn't use the wormhole to go back and see the dinosaurs. If we built one now, and established, say, a one-hundred-year time difference between the two ends, then in one hundred years someone could revisit 2001.
Although wormholes could be used to go back and forth in time, it is not possible to use one to visit a time before the wormhole was constructed. Fortunately this objection is easily met in the case of wormhole time machines. Discounting reports of ghosts, UFOs, and the like, the apparent absense of time tourists is something of a problem for time travel enthusiasts. Key historical events such as the Crucifixion would have been crowded by throngs of eager witnesses.
If it were possible to visit the past, we might expect that our descendants, perhaps thousands of years from now, would build a time machine and come back to observe us, or even to tell us about themselves. Read honest and unbiased product reviews from our users. A much-voiced objection to travel backwards in time is that we don't encounter anybody from the future. Find helpful customer reviews and review ratings for Memories with Maya by Clyde Dsouza (March 16,2013) at.
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