First of all, to give you a better concept of time I will use a personal theory of mine. When you look up at the sky at night, at the stars, what are you seeing? Do you think that collage of stars actually exists? Most of them do not. When you look at the sky at night you are seeing the past because it takes an obscene amount of time for the light from those stars to reach earth, and in that time those stars may have disappeared.
It works both ways. When an inhabitant, if there is one, on a planet around the star that you are looking at looks at our sun he is also seeing the past. So here we are, at the main idea of my speech - the possibility of different times and time travel.
The main question here is: How do you connect these 2 times? Well, the key is to go faster than the speed of light, which is 186,283 miles per second - or about the same as driving around the earth seven times in one second. If you have a hard time comprehending that going faster will connect 2 times I can put it more simply: motion slows time. This was proven in 1971.
In that year American physicists took 4 atomic clocks, left 2 on the ground, and put each of the others in airplanes flying in opposing directions around the earth at 621 mph. When the planes returned, the scientists were delighted to find that the clocks from the planes were a few billionths of a second slower than the ones left on ground. (theage.com.au)
Unfortunately, according to Einstein (who has yet to be disproved), you cannot go the speed of light because whatever solid object you used to do this (i.e.: spacecraft) would create a vortex behind it that would drag all matter... planets, stars, galaxies, etc. To put this into perspective think of when ...
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...ndmother would have been born, which means the time traveler would have been born and in effect could still go back in time and kill his grandmother.
Dr. Preston has two solutions to this. The first is that you cannot alter the course of history, so the time traveler would have endless mishaps in trying to kill his grandmother. The second is that when he killed her he immediately creates a parallel universe in which the young grandmother never existed and where he was never born, but our original universe remains.
Time travel seems to be something for only the Sci Fi movies, but it could have been invented in the future and the course of history has already been changed. As we sit here right now, all of our feelings, thoughts, and memories could have just been reset and we are in a different universe. Neither you nor I would have any recollection of it.
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