How did Einstein prove that we could travel through time by traveling at the speed of light?
He proved two things: a.) You cannot exceed the speed of light, or even achieve it. b.) If you travel at a speed close to the speed of light the passage of time for you can drastically slow down. You could, for example, push off in a space ship at close to the speed of light, and return after one space ship year. Meanwhile, back on earth 100 earth years might have elapsed. Of course, all your friends an relatives will be long dead, and you would have no way of getting back to 2007 again. RICH S Nothing wrong with Einsteien’s theories; not least because they have been experimentally verified. If you want to be absolutely 100% accurate, what he proved was that nothing could exceed the speed of light in a vacuum.