To make it easy to understand let's look at what Einstein said about time. Time is simultaneous all happening at the same time all past present and future events. Traveling from the future sometime backwards through time and killing your grandfather - as a physical act is possible. But to change history - no! The reason is that as a Universe the time stream is already set in motion and cannot be changed. For one reason is the time traveler traveling backwards in time is from the future. Meaning that the event that takes place is from a future time event activity. The activity of the time machine being developed and the person traveling in it. What happens to the time machine? It is the same as what happen to the person traveling in it. He travels back to the year 1905 to kill his grandfather then decides to go back. Well if history changed he would vanish right then and there wouldn't he? No and the reason is simple. History of the main time line cannot be changed. A visitor so to speak like the time traveler - is allowed to travel back and forth through time but is unable to change anything in it. Because he travels out of the time stream and travels at faster then light speeds to stop time and reversing it by traveling even faster in his machine - whether its vibrations or velocity. He trawls outside the time line. He travels back to the nineteenth century at the time his grandfather lived. He kills him. If Einstein were right he would vanish right there. But he doesn't - the reason is simple. Being from the future he travels back to 1905 to kill his grandfather. To do this he created a time machine and made the journey. Traveling outside the time line he travels back into it at 1905. The event of his presence in 1905 is short. Just long enough to kill his grandfather. But again nothing happens. Only two thins can happen. He could be arrested there in 1905 or he can travel back to the future. There he again is subject to arrest.

The fact that he killed someone doesn't change in either dilemma. The fact that he can't change history is a fact. He traveled outside the time line to travel back into it at 1905. He again traveled back out again to travel back again at his own time back in the future. History didn't change. The reason is the event of his travel was only parts of the time line as a whole. It has nothing to do with the stream itself: momentary interruptions so to speak in the time line but no change.

The reason he cannot change his history is because for one - he was already born in it. His impressions in the time stream are already there. Like fingerprints they can't be changed, neither can earth's history or the Universe's. Changing the time line is impossible because it has to do with changing everything else in the time line. It is a chain of events that can't be changed because it is an already existing stream. Since the time line stream is already impressed in the Universe's path expansions changing a single and or personal event would mean changing the whole Universe and that's impossible. You cannot change something that already existed or happen. Besides the time traveler already existing in the future killing his grandfather in the past does not change the fact the he already was IN THE FUTURE. History can be defined as a chain of events embedded in the Universe's fabric separate to the material world which it itself created thus can not itself change.

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