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Originally Posted by jay_21
If you are talking about time travel....Do you think it is good idea to talk about minutes and seconds????
I don't know much about these things But Does the measure of time remain same??????? Shouldn't we be takin about space-time  !!! |
Everybody gets their own set of clocks and rods to measure with so it is okay to talk about minutes and seconds, but you have to be careful when you start talking about somebody else's rod and/or clock.
If make a round trip to Alpha Centauri at near the speed of light, when you return you will find that while the trip only took a couple seconds for you, about 8.6 years passed on Earth. It's special relativity, a well tested theory. Now we need some engineers to build us a spaceship that can accelerate us up to light speed in a reasonable amount of time. Without killing us.
Despite what Steven Hawking implies in his popular science books, all theories that give a mechanism for going back in time are relatively new and are not well tested. They are interesting to talk about, but I wouldn't place my bets on any one of them yet.