I've been reading about the possibility of time travel by accelerating one end of the wormhole and then returning it to its original position giving you a wormhole with an entrance in the present and exit in the past. If time travel using wormholes as described above is possible, can anyone explain whether this is a paradox or an error in my thinking. Hypo: A wormhole is created that is equal in diameter to the Earth and the wormhole exit is accelerated so that it is 24 hours in the past. If such a wormhole were dropped into the Earth's orbit, then every 24 hours the Earth would pass through the wormhole with the effect being that the Earth never aged because with at the end of every revolution around the sun, the Earth would age 24 hours, fall into the wormhole, and become 24 hours younger again, ad infinitum so that the Earth would cease to age. If I go to the moon and watch as the 24 hour time-travel wormhole is dropped into Earth's orbit, then the Earth would cease to age yet the Sun would be unaffected and continue to age. What happens billions of years later when the sun starts to expand as it becomes a red giant. If no time passed for Earth, then how could the Earth be destroyed by the future sun yet if an observer is watching from the moon and the Sun isn't going through a similar worm-hole, then it would age, and would expand, and would destroy the Earth. What does an observer on the moon actually see happen to the Earth in the future? Is this a paradox or is my understanding flawed?