While there have been persons who have believed that all events both past and future are already set and we are simply traveling through our lives on a prerecorded tape, there never has been a shred of evidence to support the notion. While nobody can stop you from thinking that your life has been predetermined, it seems a bit pathetic.
There is no such thing as time travel. It's a work of science fiction and has its place in movies and books.
There is a thing called time dilation. Time dilation can be induced by velocity or gravity. Einstein found that space and time are not separate entities but are interwoven in what is called the fabric of space-time. The passage of events depends upon your reference frame (i.e. either how fast you are traveling or how strong the gravity well is that you are in).
Most of the time, time dilation topics refer to velocity because persons seem to understand it easier. If I am traveling 1/10 the speed of light in a space ship, I will notice dilation. Clocks on my ship tick normally and I age normally. Yet communication from my home planet seems very slightly fast. I get back home and find that everyone has aged more than me.
Persons on the home planet watched you take off and they looked at their clocks tick by normally. Yet communications received from you seemed slightly slower than usual. You land and they see you aged slightly less than they did.
The faster you travel or the stronger the gravity, the more pronounced the dilation. The once theory is now proven fact in gravity experiments dating back to the 1930s and seen even today with astronauts and spacecraft which use atomic clocks.
This is Einstein's time dilation. For each frame of reference, time appeared - and did - tick by normally. It is only when the two are later compared that one notices a difference. Neither actually traveled forwards or backwards in time. Time was never set somewhere in the future and now persons are looking at it. That is a misconception.
While the person in the space ship may potentially fly around long enough that he comes back and sees Earth and its occupants have aged 50 years, that does not imply that he has traveled 50 years into the future. He has simply lived his life in his frame of reference. According to his clock, he has aged normally.
Under no circumstances whatsoever can one get aboard a spaceship and go backwards in time. Just as he cannot get into his ship and come out later 10 years younger, so too we can never get into a spaceship and see Earth people getting younger and younger. It's not possible mathematically nor theoretically. That's the work of book and movie science fiction.How does time travel into the past work? How does time know what the past was like?
Physicists have discovered that some particles vibrate. Because of this, they attached the mental image of a violin string to create the vibration. Unfortunately, some physicists took the wording literally and wallah String Theory was born with particles shaped like actual strings.
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How does time travel into the past work? How does time know what the past was like?String Theory equations have never fit in with the Big Bang model. Soon there were at least 5 String Theory models. Because they all had similarities, the solution was to incorporate them all into one theory. The only way to do this was to have more than one universe. The multiverse was born.Report Abuse
The group later decided that there was one Universe but it had infinitely small dimensions to it that we could never perceive. The universe with 10 then 11 and now 12 dimensions. In truth, the mathematics of String Theory have never worked so they kept adding dimensions.
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How does time travel into the past work? How does time know what the past was like?Physicists could never explain how strings were the fundamental building blocks of matter. So they decided to create a membrane which all of the matter in the Universe is connected to - M Theory. If you want to believe in this theory, you can. I do not. There is no proof. Not even mathematical proofReport Abuse
How does time travel into the past work? How does time know what the past was like?But these imaginary universes are infinitely small. One trillionth of a millimeter in size. Of course the laws of physics do not apply there because the mathematics do not work out. It's moot to discuss whether you can travel back in time there because you can never go there.
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M Theorists then decided that maybe there was more than one membrane (now just called brane then p-brane). The only way to explain why gravity was weak compared to the other Forces was if it was leaking into a parallel universe. "Ah, yes!" said the M Theorists. And without any proof, the parallel
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How does time travel into the past work? How does time know what the past was like?universe was born.
Suddenly there were more and more. Bubble shaped, sheet shaped, doughnut shaped. Each with its own fanciful imaginary set of physics. The stranger and more outrageous the better.
That's about it Ed. If you want to buy into it, that's your choice. I have never cared to waste
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my time on theories which are not really theories but conjecture at best. It's popular. It will get you a speaking arrangement and sell a book or two. And let's face it. Sometimes you gotta go the extra mile to make a buck in the physics field. Ride the wave to the bank. So... is it possible???
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The problem with M Theory is that it cannot be disproven. M Theorists know this and capitalize on it. But if we can't prove it wrong, does that make it right? Alas, since we can never participate in, or see, or experience these supposed other universes it will never really matter will it?
Thanks.
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Time doesn't "know" anything, just like "Up" doesn't know if it's cloudy or sunny and "Down" doesn't know what the Earth's core is made out of.
Time actually does have a frame rate, but that's another can of worms and I won't get into it.
Time moves forward because of a law of thermodynamics that states that the total amount of chaos in a closed system will always increase. This is called entropy. If you look at the Universe itself as a closed system (which it is, at least for the sake of this explanation) it means that the total amount of chaos in the Universe must be increasing at all times.
Order vs. Chaos in this sense is basically how much something is able to do. For example, a boulder at the top of a hill has less chaos than a boulder at the bottom of the hill because the boulder at the top can roll down, but the boulder on the bottom can't roll up. A cup of coffee and a container of cream has less chaos than a cup of coffee with cream in it because you can pour the cream into the coffee and mix it but you can't unmix and unpour it.
Right after the big bang, the universe was considered extremely orderly because all of the matter and energy had a lot of potential to do work, and as time goes on that potential is gradually decreasing.
There is no way to travel back in time, it is not possible. However, there is psuedo-time travel into the future. The way it works is that if you are moving close to the speed of light, time slows down for you (from the reference from of other people). And time speeds up for other people (from your reference frame). That way, when you slow down. It may have only been a small amount of time, but to other people, a large amount of time will have passed.
Well time doesn't tell anything. besides, time travel is impossibe, like some asian scientists said a few days ago. They neutrinos in atoms, can't travel faster then light, and you NEED to travel faster then light to travel back through time. Imagine time as a river. Now imagine the direction the river is flowing, lets say down, is the future, and the direction the river is flowing FROM is UP. Now, imagine that you are only floating in the river and letting the current taking u along. That would be the present. But if you SWAM with the current, u would be traveling into the future. And as everyone knows, swimming with the current is easy. But know, if you swam against the current, you would be going into the past. It is much harder swimming against the current (going back in time) then swimming with the current (into the future). Hope this helps!!
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Historians have three kinds of sources that gives evidence of what the past was like. i primary source is a person who actually lived through or experienced an historical event who can recall it accurately. Different primary sources confirm each other. A secondary source is a person who knows a primary source or a magazine or news article written by some one who witnessed the event or talked to or interviewed a primary source (A reporter who interviews the President and writes about it would be a secondary source (the reporter and the article that s/he wrote is a secondary source who interviewed a primary source, the President.)) A tertiary source is some one who talked to or writes about a secondary source. A photograph OR A FILM is a secondary source. If it's ON CAMERA (film or digital) and it has NOT been altered or edited, it CANNOT BE DONE over or edited out (of the Congressional Record). Time DOES have the equivalent of a camera in people's memories.
As far as the future is concerned, that's entirely speculation. NO scientist has been able to explain how people who make accurate predictions more than 60 percent of the time, or who have accurate precognitive dreams or waking flashes, do what they do, not even when the predictor is a scientist as well. A good scientist will not even attempt to explain how s/he makes his/her predictions accurately, because it's an inherent conflict of interest when s/he tries to explain how s/he does the predictions accurately more than 60% of the time. It's the same thing with determining an who an expert is. A self proclaimed expert is very likely not an expert. Such a person discredits himself by claiming he is an expert.OTHER people determine who is an expert in something.
An unaltered film or a picture may be a primary source, not a secondary source. It's been a LONG time since I was a history major.
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