Isn't time travel problematic at its core?
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Time travel is impossible for two basic reasons.
One it would lead to contradictions making it impossible. For example, you go back in time and visit your grandparents and because of you visit, they don't have sex that night, the very night you father was conceived. Therefore, that particular sperm never impregnated you grandmothers egg that resulted in you father. Therefore, your father was never born; however, if he was never born, you did not go back into time to visit your grandparents. Or you might save the life of a young man that then married your grandmother and took her to another state and she never met your grandfather. Therefore, your father was never born and you do not exist. Since you do not exist, you did not go back into time.
Second, it would violate the first law of thermodynamics called the Law of Conservation of Energy. Energy/matter can be transferred from one system to another in many forms. It can not be created or destroyed. Thus, the total amount of energy/matter available in the Universe is constant.
If you could travel to the past, you would be taking your matter from the existing universe leaving less energy/matter in the existing universe. That is impossible because it violates the the first law of thermodynamics.
By the same token you mass would suddenly be added to the past increasing the matter/energy which of course is impossible. Go back a few minutes and there are two of you. You have created matter from nothing. That's impossible.
To go back in time, you would need to go faster than the speed of light (which is impossible).
And if you could go faster then the speed of light, you wouldn't be able to interact with the past, it just seems like you're in the past because of the way light is getting to you.
Look, can we dispense with the time travel already. If the Vulcans don't believe in it. Why should we. lol
No, it's simply a matter of dimension.
Dimension 0 is a single start point.
Dimension 1 is a line between a start point and an end point.
Dimension 2 is a 2nd/3rd. end point from the start point.
Dimension 3 is a point on a different plane.
Dimension 4 is the current time line from start to end.
This is the plane on which we see things. We can only see where we are and where we have been.
Dimension 5 is an alternative point from start to end.
Dimension 6 is a point that incorporates all timelines.
This is the dimension in which time travel back and forth can truly occur. In this way you can move from your current 4th dimension to another 5th dimension.
Dimension 7 is the beginning of the universe
Dimension 8 is the end of the universe
Dimension 9 is an alternative end to the universe
Dimension 10 is all possible beginnings and ends of the universe
This dimension is the one that scientists believe relates to string theory.
Dimension 11 is an alternative universe
Dimension 12 a point that emcompasses all universes
Dimension 13 is a start of a reality
Dimension 14 is an end of a reality
Dimension 15 is an alternative reality
Dimension 16 is a point containing all possible realities
Think of it like this, if you could lift a two dimension object off a page and place it back down somewhere else on the page it's moved into a third dimension and therefore does not exist for a period to the rest of the two dimensional objects. It's been placed ELSEWHERE.
Time travel would work like that, lifting you out of your fourth dimension and placing you ELSEWHERE.
So to you it would seem like you are back where you were with the necessary changes but in fact you are no longer in your timeline, but an alternative one. You could "undo the changes" merely by moving up a dimension, making the change and dropping back down to ELSEWHERE than the original two states. In other words this ELSEWHERE accounts for the fact you have moved twice.
So, no you don't have to take the whole universe back in time, merely skip a dimension of it.
Got that?
Yes, I know. It's like being an amnesiac. You EXIST in 4 dimensions that you know of, but only can rely on 3, not having any real sense of time and living moment to moment. Extrapolate that idea and it's actually quite simple.
All we need is to find out at what obtuse "angle" when can travel or wrap or warp to skip across to other points.
I'd give you a lift, but my car doesn't go there on its current gearing system.
But the biggest question is however fast you move...u are only traveling distances...may be u can, in 'negligible time ', cover the large distance ..but only covering distances cant make you move in time...
When it comes to the physics of time travel, we know virtually nothing. Although we can observe some time dilation effects due to relativity, we don't see much else. So when writers explore the world of time travel, they basically make up their own rules. The few things that naturally pop up are the questions of paradox (a person going back in time and shooting their grandfather, thereby terminating their own existence being the common analogy).
So when writers come up with ideas, they have to make them useful. Clearly, taking the entire universe back in time wouldn't much matter -- it would simply repeat itself as normal. The only useful affect of time travel is for someone or something to go back in time to change it -- so that's what they write about. Very few people actually go through the physics or logical path that time travel entails.
A proof that time travel won't happen is that we never heard about someone coming to us from the future. This means that no one -even in the future- will invent any time machine.
Time is nothing more than an illusion that we dream up. There are plenty of particles moving in the opposite direction of time than what we perceive. It is difficult to explain and not worth the trouble. Actual time travel in any useful manner would require taking an object and displacing it into a different time (usually in the past as time travel to the future is very very easy).
As much nonsense as the movie Galaxy Quest had in it, it had a very powerful concept. Why time travel? Instead, just rearrange everything in the universe to 13 seconds ago except one thing. It is the equivalent of sending that one thing back in time. Something like that would require enormous amounts of energy, the likes of which is unimagineable. So, by the time that is possible, I will just assume a smarter method is available (or such a thing be unnecessary).
It would be easier to try taking an object and pushing it along the time direction but backwards. We don't really have a good way of doing that right now, but it should be possible, I guess. The energy required wouldn't be that great actually. It would be no greater than the energy needed to walk across or something (assuming you dont go too far back). If it were to require lots of energy it would only because we would be using a very very inefficient method (like how we drive!).
Now, i won't bother getting into the complications this has for the laws of thermodynamics and most of physics. However, there is only one real argument against time travel and that is the grand father paradox. If you went back in time and killed your grandfather before you were born, you could not exist and thus could not go back in time and killed your grandfather which creates a contradiction. Modern understanding of timespace and physics have a solution to this problem however, just popping up in the past is not possible. you would have to be pushed back in the past which would in effect change the future WHILE you are traveling. The idea of just popping in out of different times is what creates these time paradoxes. thinking of time as a dimension makes it as trivial a matter as an apple falling on your head.
Now about this nonsense example that was given. If you took a heart and sent it to the past before the body existed, it would die but still EXIST in the past. There is no contradiction there. A bridge doesn't need a planet to survive (though it would need one to be useful) so it wouldn't die and it certainly would exist even if time traveling.
Now, there are serious system-wide factors to consider when moving an entire planet back in time (in respect to the rest of the universe) and those factors could easily lead to the planet freezing, melting, and/or cracking up, but the time travel will still have occurred and the planet would still EXIST in one form or another. The power to move the entire planet like that would be far beyond that of any single man, but the sun has more than enough as it does so on a daily basis.
NOTE: No, the lack of PUBLIC time travelers from the future only suggests that they dont want to come here, not that time travel is impossible. The logic there is flawed. It could mean that in the next year all life as we know it ends in one giant catastrophe before anyone got a chance to invent a time machine. It could be that we all just didn't want to go back in time. Or far more likely, we just didn't want to go back to this time period and change the future for no reason at all. Unfortunately, a lack of evidence does not constitute evidence in it of itself.
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