Time travel has long been a staple of science fiction books and movies. But will we ever be able to build a time machine and beam ourselves backward and forward in time in real life? In some sense, of ...

A physicist has distilled time travle into three lines of proof that shows if spacetime can be sliced into layers of light, every traveller must cross them in the same direction, so no journey can ...

The Doctor used this time machine, called the TARDIS, to travel through space and time on the BBC television show Doctor Who. Image via Babbel1996/Wikimedia Commons. The concept of time travel has ...

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If only our Physics department would invent a time machine. Then, I tell students, we could truly learn about the past as it actually happened, instead of making educated guesses on the basis of ...