Unravelling the mysteries of travel through time and space
Just suppose that it was possible to travel in time. Well, of course, thanks to Einstein, we know that we can travel forwards in time. His theory of relativity predicted that the faster something moves, the more time slows down. So if you got into a rocket and powered away from the Earth, time would pass more slowly for you than the people you left behind. When you returned to Earth, you would have aged a given amount, but time on Earth would have moved on much further.