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ACM Opinion

Time Travel Is Possible, but Only If You Have an Object with Infinite Mass


Time loop

Here we see a time loop. Green shows the short way through wormhole. Red shows the long way through normal space. Since the travel time on the green path could be very small compared to the red, a wormhole can allow for the possibility of time travel.

Credit: Panzi

The concept of time travel has always captured the imagination of physicists and laypersons alike. But is it really possible? Of course it is.

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