Time isn't magic, time isnt a separated energy. Time its just movement, wich is syncronized with space, so much that space and time merge into a single static hologram wich is the universe.
Now you ppl may be wondering, what's all this bollox? ok ok, hold on bitch, here's my point: Say hypotheticaly speaking that you have a time machine. This time machine rewinds time, bringing everything back as it was before, this would totally cause an endless loop, since this time machine turns ALL energy particles in the universe exactly as it was. That way everything will happen exactly the same way, until you enter AGAIN into the time machine and rewind time again, etc, etc.
Ok, so you already thought about that. Then ... say EVERYTHING goes back in time BUT what's inside the time machine. That seems like a fairly good solution to this dilema. So basicaly.. mathematicaly speaking, all you do is make every single particle of energy in the universe rewind its position back. In conclusion you are not going back in time, you are just moving things backwards, hence the reason I say time is just movement, that's how you define time.
If you were paying attention you may be thinking, "Time is definetively only one, and it cant be changed, then the universe is in time a static thing.." a static hologram if you will, in 3 dimentions plus 1 wich is time.
'Time' is just our definition of the point of the universe that we're in, so 'travelling through time' is just our expression of going to the past or future. Conclusion: No-one really cares. We say "I'm going to walk that way", not "I'm going to walk that way relative to the current position on the Earth" because it just becomes too confusing.
According to Einstienian relativity with regards to time dilation, it is possibly not so much to travel in time, but rather experience time differently.
Let me just set you up an example of what this concept basically says, for all of those who are not already in the know.
Essentially the theory is, that as an object gets closer to the speed of light, the time experienced in the object becomes less and less of that in the normal environment.
So lets say you have 2 people. One sitting on their arse on Earth living normally and travel at 'relativistic' speeds. And the other is in a ultra fast spaceship continiously orbiting the Earth for some stupid reason, in the interests of science perhaps. This ship is moving, oh lets say, 99.99% of the speed of light...around 300,000,000 metres per second or a billion kilometres per hour.
We'll leave them in there for like 10 years and see what happens.
Surely enough, 10 years pass...The dood who lived on Earth is 10 years older and his arse is sore from sitting on it too long, but the guy on the space ship, according to him and the watch he just happened to be wearing for all that time, says only 5 years passed, and he has not aged 10 years, he's only aged 5 years.
Really interesting concept, but it's REALLY far out. To get something to travel that fast and bare passengers is almost an impossiblity, as explained by another Eistienian concept, best summed up in the equation E=MC^2...and with regards to that concept, it would mean this craft would need almost unlimited energy to travel at such speeds, but also, it's mass would be getting closer and close to infinate as it approaches these speeds. Thus creating a large gravitational field of its own, and with regards to Newtons Law of Universal gravitation, this means it will cause all masses in the universe to be drawn towards it and BAM end of the universe.
"Say you're hanging from a huge cliff at the top of mt. everest and a guy comes along and says he'll save you, and proceeds to throw religious pamphlets at you while simultaniously giving a sermon." - Dustin G