That's one way, there's also relative velocity time dilation.Actually time travel is possible in a weird way: http://en.wikipedia.org/wiki/Gravitational_time_dilation
So... Do I win?
Fly west around the world... You will pass through earlier timezones. So technically you are traveling back in time!
I believe that's only for far luminescent objects in space.if you look in space you are watching the past so if you use a telescope and watch a star far away you are seeing the past (no travalling at all and still you can see the past). If you want to see the past on earth just fly away on a rocket at the speed of light and look at eart with a telescope. (if you are at the height of the sun you can look 8 minutes back in time.
I mean, we see the past lights of the far starts from the Earth: maybe, when the light of those reach the Earth, those stars even died!no it is not because you travel at the speed of light
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