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Originally Posted by jeepnut's slave
So if people travel forward in time, but it is not possible to travel back in time, they can't get back to their own time, right?
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That would make sense.
And if you were to travel at the speed of light, or near the speed of light, you would travel forward in time. This is so because speed and gravity and time are all related. It was one of Einsteins theories, I believe.
It has been proven. They took two atomic clocks, put one in a jet and one on the earth, and had the jet fly as fast as possible. When it came back, the atomic clock on the jet was a fraction of a second ahead of the one on earth. Of course we don't have anything that can fly fast enough to travel a significant distance forward in time, because like I said, you would need to go at the speed of light.
Going backward in time is a different story. You can't slow down enough to start moving backwards. However, I do believe that anything is possible, and in the future we may find a way to travel backwards.