Time travel: is it possible?

Is time travel possible? The laws of physics in the microscopic world suggest that it is because the physical processes they define at the subatomic level appear to be either entirely or mostly time symmetric.  In other words the theoretical statements that describe them remain true if the direction of time is reversed.  However, the … Read more

The connection between space and time

One of the enduring mysteries Einstein left us is what physically happens to the time dimension as one approach the speed of light.  Is it replaced by another dimension as F. Eren ÇıracıoÄŸlu suggested in his comment to our article “What antimatter can tell us about the geometry of our world?” Mar. 31, 2016 or … Read more