Quote:
Originally Posted by Over
My point is that if you don't get back to the exact time spot, you will be on the past or future, so there would be two you! One nanosecond ago is past, one nanosecond after is future. You are the present. If it would be possible to time travel, and if you wanted to go back, you would have to return to YOUR exact present, which is impossible.
The time you decide to time travel would be the day you decided to cease to exist!
|
there would only be two of your if you come backfore you go back to the past however if you overshot the time you come back by a few sec late there would not be
terms like present are based on what you see if you came back jumped 5 mins from now would you realy not call that the present. remeber that time is not even moving at the same rate base on how fast you are going. ie. from wikipeda on gps.
Quote:
|
According to the theory of relativity, due to their constant movement and height relative to the Earth-centered inertial reference frame, the clocks on the satellites are affected by their speed (special relativity) as well as their gravitational potential (general relativity). For the GPS satellites, general relativity predicts that the atomic clocks at GPS orbital altitudes will tick more rapidly, by about 45.9 microseconds (μs) per day, because they have a higher gravitational potential than atomic clocks on Earth's surface. Special relativity predicts that atomic clocks moving at GPS orbital speeds will tick more slowly than stationary ground clocks by about 7.2 μs per day. When combined, the discrepancy is about 38 microseconds per day; a difference of 4.465 parts in 1010.[58] To account for this, the frequency standard on board each satellite is given a rate offset prior to launch, making it run slightly slower than the desired frequency on Earth; specifically, at 10.22999999543 MHz instead of 10.23 MHz.[59] Since the atomic clocks on board the GPS satellites are precisely tuned, it makes the system a practical engineering application of the scientific theory of relativity in a real-world environment. Placing atomic clocks on artificial satellites to test Einstein's general theory was first proposed by Friedwardt Winterberg in 1955
|