Eminent physicist and cosmologist Dr. Stephen Hawking has recently come out to say that he no longer fears ridicule and endorses the possibility of time travel. While this might seem like a revelation, his actual endorsement is not. Let me explain.
Einstein’s Special Relativity has shown for nearly the last century that objects appear to move through time more slowly the faster they move through space. This phenomenon has been measured, though the effect is so slight in everyday experience that physicists ignore it. However, if astronauts were to travel in a spaceship very close to the speed of light, (a version of the Twin Paradox,) the effect would be very pronounced (see: Time Dilation), and our intrepid explorers would zoom forward in time – in a few years time spent away for the astronauts, the Earth and everyone on it will have aged centuries.
This is the only sort of time travel Dr. Hawking has come out to endorse – forward time travel as a result of moving quickly – which, as I mentioned above, has been a known effect for nearly a hundred years. Backward time travel in Dr. Hawking’s view is still impossible because it would allow violations of causality, which bother him. (Endorsing that kind of time travel would have truly been a revelation!)
So, nothing new here. However, anything that gets the physics of Relativity and time travel into public media is okay in my book!
…and being that Dr. Hawking is so clever, maybe that was his intent all along.