Physicists have demonstrated that waves can bounce off boundaries in time, not just in space, producing signals that behave ...

A machine to send objects into the past is not the cleanest modern evidence with regard to the physical reality of time travel. It is a laboratory illusion which causes waves to act as though part of ...

In many universes, typically those on TV shows or in movies, time travel is not much more difficult than driving downtown in any major city during rush hour. Sure, the traffic can get gnarly, but no ...

If you were to travel back in time to kill your grandparents — let’s ignore the ‘why’ here, for the sake of argument — you would never have been born. Which means there was nobody to kill your ...

From Avengers: Endgame to Looper, any fictional story about time travel has to deal with one simple fact: time travel doesn’t make any sense. While aspects of time travel exist in the real world — ...

Star Trek has used time travel plenty of times across the various shows in the franchise, and we think these are the best ...

Our editors and experts handpick every product we feature. We may earn a commission from your purchases. What makes time-travel books so fascinating? A key genre of the science fiction ecosystem, ...