If we pass through a transversable wormhole connecting two time eras, then the buildup of radiation surrounding the wormhole entrance may become infinite, which would be disastrous. (This is because radiation can pass through the wormhole, go back in time, and return after many years to enter the wormhole a second time. This process can be repeated an infinite number of times, leading to an infinite buildup of radiation. This problem can be solved, however, if the many-worlds theory holds, so that the universe splits every time radiation passes through the wormhole, and there is no infinite
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