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Old Aug 29th 2009, 11:33 PM   #1
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Question space time travel

suppose
we travel in space with speed of light our watch will move slowly as compared to earth.Now we return with the same speed on the earth. What will be the time on our watch now? It will be similar or different than watches on earth?
someone can explain please?
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Old Aug 30th 2009, 12:12 AM   #2
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Firstly we can't travel at the speed of light, but slightly less.

When we do so our watch will run slowly as seen by an observer on earth.

By the same logic, the watch on earth appears slow to us beacuse to us , the earth appears to be the one that is moving.

We "can't come back" because to do so we would have to turn. This would involve acceleration and then Special relativity no longer apllies as it requires non accelerating frames of reference.
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Old Aug 30th 2009, 06:55 AM   #3
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space time travel reply

First of all thanks for reply
If someone become successful to make time machine and he travels in past or future then how will he come back in present?
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