time travel.... Travelling to past is it possble???

Alright..... I have been fascinated by this idea of time travel thanks to many movies like "Back to the future - triology", krish, etc.......

On our trip recently, me and my cousins were discussing this mysterious and magical topic..... somehow science is exciting. Since then my grey cells have been continously working thinking in every possible way about this fourth dimension of world called time.... so I started with the most primitive of questions......

1. Is it possible to travel back in time to the past???

- Think about the opportunities we would have if we could do this. We could travel back in time and correct things that we want to. Just like in the movie Action Replayy!!!

Alright, for the people who haven't seen the movie Action Replayy, the plot of the movie in brief is.... A boy gets in to the time machine made by his girl-friend's grandpa to go back in the past and smoothen the relationship of his father and mother that once went sour even before they were married. The boy succeeds in it & as a result his parents marry 5 years earlier to when they were actually supposed to.

a. So in the above case you see, the boy changes his past & as a result his parents marry 5 years earlier. If anything like that happens this couldn't have resulted in the birth of the boy itself, which could further not result in him coming back from future, which further could not let the relationship of his mother and father become sweet, which could further not result in them marrying 5 years earlier.
But now the present truth would be, they marry 5 years earlier. Which is not possible. So if travel back in past would be possible, it would only result in catastrophe, which should be against natures will and the basic nature or element of fiber on which this universe is built.

b. There is one more reason why i believe travelling back in time would not be possible. The law or reason for my belief is one of the theories of our beloved, world famous scientist Mr. Albert Einstein. He made a very simple theory that Energy can neither be created nor be destroyed.
If we were to believe that travelling back in past would be possible it would mean, world creating a snap shot of itself every nano-second, i.e a parrallel universe is created every nano-second, i.e every momentum/movement is carried-forward in the future and the past holds a snap shot of the entire world, just like a photograph.
So practically what is being emphasised is that every nano-second energy is being created. An equal amount of energy, equal to what is present now. This breaks the basic theory on which a lot of our units function now.
So this theory becomes quite un-believable.

So I deduce that travelling BACK in time is not possible. But if you have some other theory or thoughts... Im open for a debate....

Krishna.

P.S: I just found an answer to the energy equation.... its not very convincing though... will discuss it in the next post.... till then happy timing!!!!