![]() 'This third Doctor is destined to meet up with one of the original Doctors and, together, disappear. 'For example, if in Doctor Who, two Doctors were standing right next to each other, we found that a third Doctor must exist, of negative mass, hurtling away faster than light,' explained Professor Nemiroff. The same thing would happen with any object travelling back in time. In the latest thought experiment, a spaceship would start on a launching pad on Earth, travel at five times the speed of light to a planet about 10 light-years away. Because the light from the spaceship travels slower than the spaceship, after it returns, Earthlings would see images of the spaceship on its way outīecause the light from the spaceship travels slower than the spaceship, after it returns, Earthlings would see images of the spaceship on its way out, and another on its way back.Įight years later, an image of the spaceship sitting on the launch pad will still be visible, as would two images of the spaceship on its outbound and return flights.Īfter about 10 years, the phantom spaceship pairs would destroy each other and there would only one spaceship sitting on the landing pad. 'Although in retrospect the equations were simple, it took us quite some effort to figure out how this might work,' said Professor Nemiroff. ![]() The only way this could happen was to assume that the spaceship could travel faster than the speed of light, and return. 'But what about the past? Can you get to the past simply by just travelling in a spaceship?' 'The closer one goes to the speed of light, and the longer the trip, the further into the future you can go. 'It is well known - and not controversial - that you can time travel to the future by just travelling quickly in a spaceship and coming back,' said Professor Nemiroff. It would then turn around to return home to a landing pad not far from the lift-off site, according to a report in LiveScience. The example involved a spaceship that would start on a launching pad on Earth, travel at five times the speed of light to a planet about 10 light-years away. 'So a student and I tried to work out for ourselves a very simple example.' 'Even though I am a professional astrophysicist, I didn't understand the details of how this might work. ![]() 'I had heard many times that faster-than-light motion result in backwards time travel,' Robert Nemiroff, a physicist at Michigan Technological University told
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