Communications of the ACM
ACM Opinion
Time Travel Is Possible, but Only If You Have an Object with Infinite Mass
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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