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Originally posted by supersix2
Actually Einstien proved that if you could travel at the speed of light you could travel backwards in time. I'll look into this more.
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He actually didn't prove this. He just didn't disprove it! A VERY BIG difference! You would also need to travel faster then the speed of light (an impossibility?) to experience this "negative" time of arriving somewhere before you've left. A nice paradox to get to grips with I should imagine!
The big point is that everything is relative. There is no"absoloute" time line. The photons experience their own "personal" timeline as do you and everyone else. If your speed relative to someone else alters then also your individual concepts of time will. Luckily this effect only occurs at near to the speed of light or else it could lead to many problems in our daily lives
There are many interesting paradox associated with Special Relativity. Any good Undergraduate Physics text book can help or google a few. Try and get to grips with "the twin paradox" if you're interested.