if there is a time machine around us, we would know, or we wouldnt, but the question is, can you alter your own past or can you visit your own future and come back to change the present?
i believe if u can travel thru time, there will be some constraints... it wont be forced but it will be inevitable.. it will be a law enforced by the time itself that you cannot alter the past as long as you have the possibility to change the present or the future.. nature will only determine what you can or can not do. cause if pasts change there is no present and future. or may be u can go to a past which is very distant, where there is a little chance that your work will alter the present drastically, like we know a little about ancient civilizations, we only know they were great, we only know pyramids, we know its hard to build even with present technologies, but yet it was built at a time when it was kind of impossible so may be who knows, ppl knew something tht we dont.
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if we believe religion, in Islam, our prophet(sm) went to mi'raz and visited Allah, he also visited Heaven and Hell, he saw ppls sufferings, now at tht time(around 615-640AD), he was not supposed to see ppls in the hell because the earth was still livable, we all didnt die and there was no judgement day.
Sura XVII, in the Holy Qur'an, which says:
"Glory be to Allah Who did take his servant For a journey by night From the Sacred Mosque To the Farthest Mosque."
"This is taken as a reference to Prophet Mohammed's dream in which two archangels are said to have visited him, "purified his heart and filled him with knowledge and faith." Then a magical creature with wings, called Buraq, transported him to Jerusalem from where he ascended to heaven.
Metanexus Institute ( http://www.metanexus.net/metanexus_o...ticle.asp?7692)
"The buraqis a very fast animal; the length of the buraq's stride is the farthest distance it's eye can see."
http://www.geocities.com/islamicmira...acle_of_al.htm
there are several incidents that says tht he travelled a lot and in a little time, and he also saw the heaven and hell with people suffering in it. in my opinion, it was possible because of the speed that buraq has.
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Now some science stuffs
we all know that speed, time and space is interrelated. and to some theory it is believed that, if u gain a speed that is similar to the speed of light you will reach a point where the time is not moving (relativity).
we are familiar with the equation v=d/t All it says is velocity (speed) equals distance travelled divided by
time.
v = d/t
Here's an example of how it can be used...

And here are two more examples that show how speed can stay the same even though distance and time can change...

See the relationship between speed, distance and time?

http://www.pbs.org/wgbh/nova/time/think.html

The theory of relativity is in fact two theories. The special theory of relativity (1905) and the general theory of relativity (1915). The special theory gives a unified account of the laws of mechanics and of electromagnetism. Einstein rejected the concepts of absolute space and time and made two postulates the laws of nature are the same for all observers in uniform relative motion and the speed of light is the same for all such observers.
The transformation of time implies that two events that are simultaneous according to one observer will not necessarily be so according to another in uniform relative motion. It will appear to two observers in uniform relative motion that each other's clock runs slowly. This is the phenomenon of time dilation.
A mathematical formulation of the special theory of relativity is based on the idea that an event is specified by four co-ordinates: three spatial co-ordinates and one time co-ordinate. These co-ordinates define a four-dimensional space and the motion of a particle can be described by a curve in this space.
The special theory of relativity is concerned with relative motion between non-accelerated frames of reference. The general theory deals with general relative motion between accelerated frames of reference. In accelerated systems of reference, certain fictitious forces are observed, such as the centrifugal and Coriolis forces found in rotating systems. These are known as fictitious forces because they disappear when the observer transforms to an non-accelerated system.
The predictions of general relativity only differ from Newton's theory by small amounts and most tests of the theory have been carried out through observations in astronomy. For example, it explains the shift in the perihelion of Mercury, the bending of light or other electromagnetic radiation in the presence of large bodies, and the Einstein shift.
http://www.scifiscience.co.uk/guide.htm
HyperDrive
We know from Einstein that space is like a fabric (called space-time) and that the fabric can be bent or twisted. If we had a technology that would compress space-time at the front of our spaceship and at the same time expand it at the rear of our spaceship then we would have a hyperdrive system. Sounds easy eh? The only way of compressing the fabric of space is to use a large amount of mass (like a star or a black hole). A definite challenge, and one beyond us for the foreseeable future. However, that doesn't mean it's impossible.
The other alternative is to build stable worm hole using two very large masses at each end, to create a tunnel through space-time. Again in theory it sounds easy enough, but the technology for this would be another "challenge" as well.
http://www.scifiscience.co.uk/hyperdrive.htm

Interesting Readings:

a lots but read these 2 links

http://science.howstuffworks.com/relativity.htm
http://science.howstuffworks.com/time-travel.htm

read the other links of this post aswell

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Once the Game is Over, The King and the Pawn goes into the Same Box.

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