RICHARD KAIL / SCIENCE PHOTO LIBRARY RICHARD KAIL / SCIENCE PHOTO LIBRARY
Time travel, conceptual image. This image represents a person travelling through a corridor of time in a multi-faceted universe. Many scientists believe that time travel into the past (and hence returning from the future) is impossible because of the paradoxes it would cause. However, some solutions to Einstein's equations of space-time do appear to allow brief travel through time.
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